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[NFC][CodeGen][SelectionDAG] Tests for X % C == 0 codegen improvement.
Hacker's Delight 10-17: when C is constant, the result of X % C == 0 can be computed more cheaply without actually calculating the remainder. The motivation is discussed here: https://bugs.llvm.org/show_bug.cgi?id=35479. Patch by: hermord (Dmytro Shynkevych)! For https://reviews.llvm.org/D50222 llvm-svn: 341047
This commit is contained in:
Roman Lebedev
parent
3953710755
commit
35f00e690f
41
test/CodeGen/AArch64/urem-seteq-optsize.ll
Normal file
41
test/CodeGen/AArch64/urem-seteq-optsize.ll
Normal file
@ -0,0 +1,41 @@
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=aarch64-unknown-linux-gnu < %s | FileCheck %s
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; On AArch64, division in expensive. BuildRemEqFold should therefore run even
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; when optimizing for size. Only optimizing for minimum size retains a plain div.
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define i32 @test_minsize(i32 %X) optsize minsize nounwind readnone {
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; CHECK-LABEL: test_minsize:
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; CHECK: // %bb.0:
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; CHECK-NEXT: mov w8, #5
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; CHECK-NEXT: udiv w8, w0, w8
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; CHECK-NEXT: add w8, w8, w8, lsl #2
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; CHECK-NEXT: mov w9, #-10
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; CHECK-NEXT: cmp w0, w8
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; CHECK-NEXT: mov w8, #42
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; CHECK-NEXT: csel w0, w8, w9, eq
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; CHECK-NEXT: ret
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%rem = urem i32 %X, 5
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%cmp = icmp eq i32 %rem, 0
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%ret = select i1 %cmp, i32 42, i32 -10
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ret i32 %ret
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}
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define i32 @test_optsize(i32 %X) optsize nounwind readnone {
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; CHECK-LABEL: test_optsize:
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; CHECK: // %bb.0:
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; CHECK-NEXT: mov w8, #52429
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; CHECK-NEXT: movk w8, #52428, lsl #16
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; CHECK-NEXT: umull x8, w0, w8
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; CHECK-NEXT: lsr x8, x8, #34
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; CHECK-NEXT: add w8, w8, w8, lsl #2
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; CHECK-NEXT: mov w9, #-10
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; CHECK-NEXT: cmp w0, w8
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; CHECK-NEXT: mov w8, #42
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; CHECK-NEXT: csel w0, w8, w9, eq
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; CHECK-NEXT: ret
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%rem = urem i32 %X, 5
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%cmp = icmp eq i32 %rem, 0
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%ret = select i1 %cmp, i32 42, i32 -10
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ret i32 %ret
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}
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153
test/CodeGen/AArch64/urem-seteq.ll
Normal file
153
test/CodeGen/AArch64/urem-seteq.ll
Normal file
@ -0,0 +1,153 @@
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=aarch64-unknown-linux-gnu < %s | FileCheck %s
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; This tests the BuildREMEqFold optimization with UREM, i32, odd divisor, SETEQ.
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; The corresponding pseudocode is:
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; Q <- [N * multInv(5, 2^32)] <=> [N * 0xCCCCCCCD] <=> [N * (-858993459)]
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; res <- [Q <= (2^32 - 1) / 5] <=> [Q <= 858993459] <=> [Q < 858993460]
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define i32 @test_urem_odd(i32 %X) nounwind readnone {
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; CHECK-LABEL: test_urem_odd:
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; CHECK: // %bb.0:
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; CHECK-NEXT: mov w8, #52429
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; CHECK-NEXT: movk w8, #52428, lsl #16
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; CHECK-NEXT: umull x8, w0, w8
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; CHECK-NEXT: lsr x8, x8, #34
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; CHECK-NEXT: add w8, w8, w8, lsl #2
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; CHECK-NEXT: cmp w0, w8
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; CHECK-NEXT: cset w0, eq
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; CHECK-NEXT: ret
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%urem = urem i32 %X, 5
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%cmp = icmp eq i32 %urem, 0
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%ret = zext i1 %cmp to i32
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ret i32 %ret
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}
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; This is like test_urem_odd, except the divisor has bit 30 set.
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define i32 @test_urem_odd_bit30(i32 %X) nounwind readnone {
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; CHECK-LABEL: test_urem_odd_bit30:
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; CHECK: // %bb.0:
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; CHECK-NEXT: mov w8, #-11
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; CHECK-NEXT: umull x8, w0, w8
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; CHECK-NEXT: mov w9, #3
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; CHECK-NEXT: lsr x8, x8, #62
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; CHECK-NEXT: movk w9, #16384, lsl #16
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; CHECK-NEXT: msub w8, w8, w9, w0
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; CHECK-NEXT: cmp w8, #0 // =0
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; CHECK-NEXT: cset w0, eq
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; CHECK-NEXT: ret
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%urem = urem i32 %X, 1073741827
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%cmp = icmp eq i32 %urem, 0
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%ret = zext i1 %cmp to i32
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ret i32 %ret
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}
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; This is like test_urem_odd, except the divisor has bit 31 set.
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define i32 @test_urem_odd_bit31(i32 %X) nounwind readnone {
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; CHECK-LABEL: test_urem_odd_bit31:
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; CHECK: // %bb.0:
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; CHECK-NEXT: mov w8, w0
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; CHECK-NEXT: lsl x9, x8, #30
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; CHECK-NEXT: sub x8, x9, x8
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; CHECK-NEXT: lsr x8, x8, #61
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; CHECK-NEXT: mov w9, #-2147483645
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; CHECK-NEXT: msub w8, w8, w9, w0
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; CHECK-NEXT: cmp w8, #0 // =0
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; CHECK-NEXT: cset w0, eq
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; CHECK-NEXT: ret
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%urem = urem i32 %X, 2147483651
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%cmp = icmp eq i32 %urem, 0
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%ret = zext i1 %cmp to i32
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ret i32 %ret
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}
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; This tests the BuildREMEqFold optimization with UREM, i16, even divisor, SETNE.
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; In this case, D <=> 14 <=> 7 * 2^1, so D0 = 7 and K = 1.
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; The corresponding pseudocode is:
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; Q <- [N * multInv(D0, 2^16)] <=> [N * multInv(7, 2^16)] <=> [N * 28087]
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; Q <- [Q >>rot K] <=> [Q >>rot 1]
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; res <- ![Q <= (2^16 - 1) / 7] <=> ![Q <= 9362] <=> [Q > 9362]
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define i16 @test_urem_even(i16 %X) nounwind readnone {
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; CHECK-LABEL: test_urem_even:
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; CHECK: // %bb.0:
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; CHECK-NEXT: mov w10, #9363
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; CHECK-NEXT: ubfx w9, w0, #1, #15
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; CHECK-NEXT: movk w10, #37449, lsl #16
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; CHECK-NEXT: umull x9, w9, w10
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; CHECK-NEXT: and w8, w0, #0xffff
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; CHECK-NEXT: lsr x9, x9, #34
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; CHECK-NEXT: orr w10, wzr, #0xe
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; CHECK-NEXT: msub w8, w9, w10, w8
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; CHECK-NEXT: cmp w8, #0 // =0
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; CHECK-NEXT: cset w0, ne
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; CHECK-NEXT: ret
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%urem = urem i16 %X, 14
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%cmp = icmp ne i16 %urem, 0
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%ret = zext i1 %cmp to i16
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ret i16 %ret
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}
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; This is like test_urem_even, except the divisor has bit 30 set.
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define i32 @test_urem_even_bit30(i32 %X) nounwind readnone {
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; CHECK-LABEL: test_urem_even_bit30:
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; CHECK: // %bb.0:
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; CHECK-NEXT: mov w8, #-415
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; CHECK-NEXT: umull x8, w0, w8
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; CHECK-NEXT: mov w9, #104
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; CHECK-NEXT: lsr x8, x8, #62
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; CHECK-NEXT: movk w9, #16384, lsl #16
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; CHECK-NEXT: msub w8, w8, w9, w0
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; CHECK-NEXT: cmp w8, #0 // =0
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; CHECK-NEXT: cset w0, eq
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; CHECK-NEXT: ret
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%urem = urem i32 %X, 1073741928
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%cmp = icmp eq i32 %urem, 0
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%ret = zext i1 %cmp to i32
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ret i32 %ret
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}
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; This is like test_urem_odd, except the divisor has bit 31 set.
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define i32 @test_urem_even_bit31(i32 %X) nounwind readnone {
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; CHECK-LABEL: test_urem_even_bit31:
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; CHECK: // %bb.0:
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; CHECK-NEXT: mov w8, #65435
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; CHECK-NEXT: movk w8, #32767, lsl #16
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; CHECK-NEXT: umull x8, w0, w8
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; CHECK-NEXT: mov w9, #102
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; CHECK-NEXT: lsr x8, x8, #62
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; CHECK-NEXT: movk w9, #32768, lsl #16
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; CHECK-NEXT: msub w8, w8, w9, w0
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; CHECK-NEXT: cmp w8, #0 // =0
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; CHECK-NEXT: cset w0, eq
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; CHECK-NEXT: ret
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%urem = urem i32 %X, 2147483750
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%cmp = icmp eq i32 %urem, 0
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%ret = zext i1 %cmp to i32
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ret i32 %ret
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}
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; We should not proceed with this fold if the divisor is 1 or -1
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define i32 @test_urem_one(i32 %X) nounwind readnone {
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; CHECK-LABEL: test_urem_one:
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; CHECK: // %bb.0:
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; CHECK-NEXT: orr w0, wzr, #0x1
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; CHECK-NEXT: ret
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%urem = urem i32 %X, 1
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%cmp = icmp eq i32 %urem, 0
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%ret = zext i1 %cmp to i32
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ret i32 %ret
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}
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; We can lower remainder of division by powers of two much better elsewhere;
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; also, BuildREMEqFold does not work when the only odd factor of the divisor is 1.
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; This ensures we don't touch powers of two.
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define i32 @test_urem_pow2(i32 %X) nounwind readnone {
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; CHECK-LABEL: test_urem_pow2:
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; CHECK: // %bb.0:
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; CHECK-NEXT: tst w0, #0xf
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; CHECK-NEXT: cset w0, eq
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; CHECK-NEXT: ret
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%urem = urem i32 %X, 16
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%cmp = icmp eq i32 %urem, 0
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%ret = zext i1 %cmp to i32
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ret i32 %ret
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}
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81
test/CodeGen/X86/urem-seteq-optsize.ll
Normal file
81
test/CodeGen/X86/urem-seteq-optsize.ll
Normal file
@ -0,0 +1,81 @@
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=i686-unknown-linux-gnu < %s | FileCheck %s --check-prefixes=CHECK,X86
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; RUN: llc -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s --check-prefixes=CHECK,X64,NOBMI2
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; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mattr=+bmi2 < %s | FileCheck %s --check-prefixes=CHECK,X64,BMI2
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; On X86, division in expensive. BuildRemEqFold should therefore run even
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; when optimizing for size. Only optimizing for minimum size retains a plain div.
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define i32 @test_minsize(i32 %X) optsize minsize nounwind readnone {
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; X86-LABEL: test_minsize:
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; X86: # %bb.0:
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; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X86-NEXT: pushl $5
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; X86-NEXT: popl %ecx
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; X86-NEXT: xorl %edx, %edx
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; X86-NEXT: divl %ecx
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; X86-NEXT: testl %edx, %edx
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; X86-NEXT: je .LBB0_1
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; X86-NEXT: # %bb.2:
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; X86-NEXT: pushl $-10
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; X86-NEXT: popl %eax
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; X86-NEXT: retl
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; X86-NEXT: .LBB0_1:
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; X86-NEXT: pushl $42
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; X86-NEXT: popl %eax
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; X86-NEXT: retl
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;
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; X64-LABEL: test_minsize:
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; X64: # %bb.0:
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; X64-NEXT: pushq $5
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; X64-NEXT: popq %rcx
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; X64-NEXT: xorl %edx, %edx
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; X64-NEXT: movl %edi, %eax
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; X64-NEXT: divl %ecx
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; X64-NEXT: testl %edx, %edx
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; X64-NEXT: pushq $42
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; X64-NEXT: popq %rcx
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; X64-NEXT: pushq $-10
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; X64-NEXT: popq %rax
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; X64-NEXT: cmovel %ecx, %eax
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; X64-NEXT: retq
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%rem = urem i32 %X, 5
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%cmp = icmp eq i32 %rem, 0
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%ret = select i1 %cmp, i32 42, i32 -10
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ret i32 %ret
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}
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define i32 @test_optsize(i32 %X) optsize nounwind readnone {
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; X86-LABEL: test_optsize:
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; X86: # %bb.0:
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; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
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; X86-NEXT: movl $-858993459, %edx # imm = 0xCCCCCCCD
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; X86-NEXT: movl %ecx, %eax
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; X86-NEXT: mull %edx
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; X86-NEXT: shrl $2, %edx
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; X86-NEXT: leal (%edx,%edx,4), %eax
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; X86-NEXT: cmpl %eax, %ecx
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; X86-NEXT: movl $42, %eax
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; X86-NEXT: je .LBB1_2
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; X86-NEXT: # %bb.1:
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; X86-NEXT: movl $-10, %eax
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; X86-NEXT: .LBB1_2:
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; X86-NEXT: retl
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;
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; X64-LABEL: test_optsize:
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; X64: # %bb.0:
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; X64-NEXT: movl %edi, %eax
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; X64-NEXT: movl $3435973837, %ecx # imm = 0xCCCCCCCD
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; X64-NEXT: imulq %rax, %rcx
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; X64-NEXT: shrq $34, %rcx
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; X64-NEXT: leal (%rcx,%rcx,4), %eax
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; X64-NEXT: cmpl %eax, %edi
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; X64-NEXT: movl $42, %ecx
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; X64-NEXT: movl $-10, %eax
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; X64-NEXT: cmovel %ecx, %eax
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; X64-NEXT: retq
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%rem = urem i32 %X, 5
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%cmp = icmp eq i32 %rem, 0
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%ret = select i1 %cmp, i32 42, i32 -10
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ret i32 %ret
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}
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248
test/CodeGen/X86/urem-seteq.ll
Normal file
248
test/CodeGen/X86/urem-seteq.ll
Normal file
@ -0,0 +1,248 @@
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=i686-unknown-linux-gnu < %s | FileCheck %s --check-prefixes=CHECK,X86
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; RUN: llc -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s --check-prefixes=CHECK,X64,NOBMI2
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; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mattr=+bmi2 < %s | FileCheck %s --check-prefixes=CHECK,X64,BMI2
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; This tests the BuildREMEqFold optimization with UREM, i32, odd divisor, SETEQ.
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; The corresponding pseudocode is:
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; Q <- [N * multInv(5, 2^32)] <=> [N * 0xCCCCCCCD] <=> [N * (-858993459)]
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; res <- [Q <= (2^32 - 1) / 5] <=> [Q <= 858993459] <=> [Q < 858993460]
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define i32 @test_urem_odd(i32 %X) nounwind readnone {
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; X86-LABEL: test_urem_odd:
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; X86: # %bb.0:
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; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
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; X86-NEXT: movl $-858993459, %edx # imm = 0xCCCCCCCD
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; X86-NEXT: movl %ecx, %eax
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; X86-NEXT: mull %edx
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; X86-NEXT: shrl $2, %edx
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; X86-NEXT: leal (%edx,%edx,4), %edx
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; X86-NEXT: xorl %eax, %eax
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; X86-NEXT: cmpl %edx, %ecx
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; X86-NEXT: sete %al
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; X86-NEXT: retl
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;
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; X64-LABEL: test_urem_odd:
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; X64: # %bb.0:
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; X64-NEXT: movl %edi, %eax
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; X64-NEXT: movl $3435973837, %ecx # imm = 0xCCCCCCCD
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; X64-NEXT: imulq %rax, %rcx
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; X64-NEXT: shrq $34, %rcx
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; X64-NEXT: leal (%rcx,%rcx,4), %ecx
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; X64-NEXT: xorl %eax, %eax
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; X64-NEXT: cmpl %ecx, %edi
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; X64-NEXT: sete %al
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; X64-NEXT: retq
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%urem = urem i32 %X, 5
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%cmp = icmp eq i32 %urem, 0
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%ret = zext i1 %cmp to i32
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ret i32 %ret
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}
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; This is like test_urem_odd, except the divisor has bit 30 set.
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define i32 @test_urem_odd_bit30(i32 %X) nounwind readnone {
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; X86-LABEL: test_urem_odd_bit30:
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; X86: # %bb.0:
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; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
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; X86-NEXT: movl $-11, %edx
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; X86-NEXT: movl %ecx, %eax
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; X86-NEXT: mull %edx
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; X86-NEXT: shrl $30, %edx
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; X86-NEXT: imull $1073741827, %edx, %edx # imm = 0x40000003
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; X86-NEXT: xorl %eax, %eax
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; X86-NEXT: cmpl %edx, %ecx
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; X86-NEXT: sete %al
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; X86-NEXT: retl
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;
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; X64-LABEL: test_urem_odd_bit30:
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; X64: # %bb.0:
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; X64-NEXT: movl %edi, %eax
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; X64-NEXT: movl $4294967285, %ecx # imm = 0xFFFFFFF5
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; X64-NEXT: imulq %rax, %rcx
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; X64-NEXT: shrq $62, %rcx
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; X64-NEXT: imull $1073741827, %ecx, %ecx # imm = 0x40000003
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; X64-NEXT: xorl %eax, %eax
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; X64-NEXT: cmpl %ecx, %edi
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; X64-NEXT: sete %al
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; X64-NEXT: retq
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%urem = urem i32 %X, 1073741827
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%cmp = icmp eq i32 %urem, 0
|
||||
%ret = zext i1 %cmp to i32
|
||||
ret i32 %ret
|
||||
}
|
||||
|
||||
; This is like test_urem_odd, except the divisor has bit 31 set.
|
||||
define i32 @test_urem_odd_bit31(i32 %X) nounwind readnone {
|
||||
; X86-LABEL: test_urem_odd_bit31:
|
||||
; X86: # %bb.0:
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
|
||||
; X86-NEXT: movl $1073741823, %edx # imm = 0x3FFFFFFF
|
||||
; X86-NEXT: movl %ecx, %eax
|
||||
; X86-NEXT: mull %edx
|
||||
; X86-NEXT: shrl $29, %edx
|
||||
; X86-NEXT: imull $-2147483645, %edx, %edx # imm = 0x80000003
|
||||
; X86-NEXT: xorl %eax, %eax
|
||||
; X86-NEXT: cmpl %edx, %ecx
|
||||
; X86-NEXT: sete %al
|
||||
; X86-NEXT: retl
|
||||
;
|
||||
; X64-LABEL: test_urem_odd_bit31:
|
||||
; X64: # %bb.0:
|
||||
; X64-NEXT: movl %edi, %eax
|
||||
; X64-NEXT: movq %rax, %rcx
|
||||
; X64-NEXT: shlq $30, %rcx
|
||||
; X64-NEXT: subq %rax, %rcx
|
||||
; X64-NEXT: shrq $61, %rcx
|
||||
; X64-NEXT: imull $-2147483645, %ecx, %ecx # imm = 0x80000003
|
||||
; X64-NEXT: xorl %eax, %eax
|
||||
; X64-NEXT: cmpl %ecx, %edi
|
||||
; X64-NEXT: sete %al
|
||||
; X64-NEXT: retq
|
||||
%urem = urem i32 %X, 2147483651
|
||||
%cmp = icmp eq i32 %urem, 0
|
||||
%ret = zext i1 %cmp to i32
|
||||
ret i32 %ret
|
||||
}
|
||||
|
||||
; This tests the BuildREMEqFold optimization with UREM, i16, even divisor, SETNE.
|
||||
; In this case, D <=> 14 <=> 7 * 2^1, so D0 = 7 and K = 1.
|
||||
; The corresponding pseudocode is:
|
||||
; Q <- [N * multInv(D0, 2^16)] <=> [N * multInv(7, 2^16)] <=> [N * 28087]
|
||||
; Q <- [Q >>rot K] <=> [Q >>rot 1]
|
||||
; res <- ![Q <= (2^16 - 1) / 7] <=> ![Q <= 9362] <=> [Q > 9362]
|
||||
define i16 @test_urem_even(i16 %X) nounwind readnone {
|
||||
; X86-LABEL: test_urem_even:
|
||||
; X86: # %bb.0:
|
||||
; X86-NEXT: movzwl {{[0-9]+}}(%esp), %ecx
|
||||
; X86-NEXT: movl %ecx, %eax
|
||||
; X86-NEXT: shrl %eax
|
||||
; X86-NEXT: imull $18725, %eax, %eax # imm = 0x4925
|
||||
; X86-NEXT: shrl $17, %eax
|
||||
; X86-NEXT: movl %eax, %edx
|
||||
; X86-NEXT: shll $4, %edx
|
||||
; X86-NEXT: subl %eax, %edx
|
||||
; X86-NEXT: subl %eax, %edx
|
||||
; X86-NEXT: xorl %eax, %eax
|
||||
; X86-NEXT: cmpw %dx, %cx
|
||||
; X86-NEXT: setne %al
|
||||
; X86-NEXT: # kill: def $ax killed $ax killed $eax
|
||||
; X86-NEXT: retl
|
||||
;
|
||||
; X64-LABEL: test_urem_even:
|
||||
; X64: # %bb.0:
|
||||
; X64-NEXT: movzwl %di, %ecx
|
||||
; X64-NEXT: movl %ecx, %eax
|
||||
; X64-NEXT: shrl %eax
|
||||
; X64-NEXT: imull $18725, %eax, %eax # imm = 0x4925
|
||||
; X64-NEXT: shrl $17, %eax
|
||||
; X64-NEXT: movl %eax, %edx
|
||||
; X64-NEXT: shll $4, %edx
|
||||
; X64-NEXT: subl %eax, %edx
|
||||
; X64-NEXT: subl %eax, %edx
|
||||
; X64-NEXT: xorl %eax, %eax
|
||||
; X64-NEXT: cmpw %dx, %cx
|
||||
; X64-NEXT: setne %al
|
||||
; X64-NEXT: # kill: def $ax killed $ax killed $eax
|
||||
; X64-NEXT: retq
|
||||
%urem = urem i16 %X, 14
|
||||
%cmp = icmp ne i16 %urem, 0
|
||||
%ret = zext i1 %cmp to i16
|
||||
ret i16 %ret
|
||||
}
|
||||
|
||||
; This is like test_urem_even, except the divisor has bit 30 set.
|
||||
define i32 @test_urem_even_bit30(i32 %X) nounwind readnone {
|
||||
; X86-LABEL: test_urem_even_bit30:
|
||||
; X86: # %bb.0:
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
|
||||
; X86-NEXT: movl $-415, %edx # imm = 0xFE61
|
||||
; X86-NEXT: movl %ecx, %eax
|
||||
; X86-NEXT: mull %edx
|
||||
; X86-NEXT: shrl $30, %edx
|
||||
; X86-NEXT: imull $1073741928, %edx, %edx # imm = 0x40000068
|
||||
; X86-NEXT: xorl %eax, %eax
|
||||
; X86-NEXT: cmpl %edx, %ecx
|
||||
; X86-NEXT: sete %al
|
||||
; X86-NEXT: retl
|
||||
;
|
||||
; X64-LABEL: test_urem_even_bit30:
|
||||
; X64: # %bb.0:
|
||||
; X64-NEXT: movl %edi, %eax
|
||||
; X64-NEXT: movl $4294966881, %ecx # imm = 0xFFFFFE61
|
||||
; X64-NEXT: imulq %rax, %rcx
|
||||
; X64-NEXT: shrq $62, %rcx
|
||||
; X64-NEXT: imull $1073741928, %ecx, %ecx # imm = 0x40000068
|
||||
; X64-NEXT: xorl %eax, %eax
|
||||
; X64-NEXT: cmpl %ecx, %edi
|
||||
; X64-NEXT: sete %al
|
||||
; X64-NEXT: retq
|
||||
%urem = urem i32 %X, 1073741928
|
||||
%cmp = icmp eq i32 %urem, 0
|
||||
%ret = zext i1 %cmp to i32
|
||||
ret i32 %ret
|
||||
}
|
||||
|
||||
; This is like test_urem_odd, except the divisor has bit 31 set.
|
||||
define i32 @test_urem_even_bit31(i32 %X) nounwind readnone {
|
||||
; X86-LABEL: test_urem_even_bit31:
|
||||
; X86: # %bb.0:
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
|
||||
; X86-NEXT: movl $2147483547, %edx # imm = 0x7FFFFF9B
|
||||
; X86-NEXT: movl %ecx, %eax
|
||||
; X86-NEXT: mull %edx
|
||||
; X86-NEXT: shrl $30, %edx
|
||||
; X86-NEXT: imull $-2147483546, %edx, %edx # imm = 0x80000066
|
||||
; X86-NEXT: xorl %eax, %eax
|
||||
; X86-NEXT: cmpl %edx, %ecx
|
||||
; X86-NEXT: sete %al
|
||||
; X86-NEXT: retl
|
||||
;
|
||||
; X64-LABEL: test_urem_even_bit31:
|
||||
; X64: # %bb.0:
|
||||
; X64-NEXT: movl %edi, %eax
|
||||
; X64-NEXT: imulq $2147483547, %rax, %rax # imm = 0x7FFFFF9B
|
||||
; X64-NEXT: shrq $62, %rax
|
||||
; X64-NEXT: imull $-2147483546, %eax, %ecx # imm = 0x80000066
|
||||
; X64-NEXT: xorl %eax, %eax
|
||||
; X64-NEXT: cmpl %ecx, %edi
|
||||
; X64-NEXT: sete %al
|
||||
; X64-NEXT: retq
|
||||
%urem = urem i32 %X, 2147483750
|
||||
%cmp = icmp eq i32 %urem, 0
|
||||
%ret = zext i1 %cmp to i32
|
||||
ret i32 %ret
|
||||
}
|
||||
|
||||
; We should not proceed with this fold if the divisor is 1 or -1
|
||||
define i32 @test_urem_one(i32 %X) nounwind readnone {
|
||||
; CHECK-LABEL: test_urem_one:
|
||||
; CHECK: # %bb.0:
|
||||
; CHECK-NEXT: movl $1, %eax
|
||||
; CHECK-NEXT: ret{{[l|q]}}
|
||||
%urem = urem i32 %X, 1
|
||||
%cmp = icmp eq i32 %urem, 0
|
||||
%ret = zext i1 %cmp to i32
|
||||
ret i32 %ret
|
||||
}
|
||||
|
||||
; We can lower remainder of division by powers of two much better elsewhere;
|
||||
; also, BuildREMEqFold does not work when the only odd factor of the divisor is 1.
|
||||
; This ensures we don't touch powers of two.
|
||||
define i32 @test_urem_pow2(i32 %X) nounwind readnone {
|
||||
; X86-LABEL: test_urem_pow2:
|
||||
; X86: # %bb.0:
|
||||
; X86-NEXT: xorl %eax, %eax
|
||||
; X86-NEXT: testb $15, {{[0-9]+}}(%esp)
|
||||
; X86-NEXT: sete %al
|
||||
; X86-NEXT: retl
|
||||
;
|
||||
; X64-LABEL: test_urem_pow2:
|
||||
; X64: # %bb.0:
|
||||
; X64-NEXT: xorl %eax, %eax
|
||||
; X64-NEXT: testb $15, %dil
|
||||
; X64-NEXT: sete %al
|
||||
; X64-NEXT: retq
|
||||
%urem = urem i32 %X, 16
|
||||
%cmp = icmp eq i32 %urem, 0
|
||||
%ret = zext i1 %cmp to i32
|
||||
ret i32 %ret
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user