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1d6f130191
Not sure this is the best fix, but it saves an instruction for certain constructs involving variable shifts. Differential Revision: https://reviews.llvm.org/D55572 llvm-svn: 351768
75 lines
1.9 KiB
LLVM
75 lines
1.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=aarch64 < %s | FileCheck %s
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; Check that we optimize out AND instructions and ADD/SUB instructions
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; modulo the shift size to take advantage of the implicit mod done on
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; the shift amount value by the variable shift/rotate instructions.
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define i32 @test1(i32 %x, i64 %y) {
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; CHECK-LABEL: test1:
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; CHECK: // %bb.0:
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; CHECK-NEXT: lsr w0, w0, w1
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; CHECK-NEXT: ret
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%sh_prom = trunc i64 %y to i32
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%shr = lshr i32 %x, %sh_prom
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ret i32 %shr
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}
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define i64 @test2(i32 %x, i64 %y) {
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; CHECK-LABEL: test2:
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; CHECK: // %bb.0:
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; CHECK-NEXT: neg w[[REG:[0-9]+]], w0
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; CHECK-NEXT: asr x0, x1, x[[REG]]
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; CHECK-NEXT: ret
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%sub9 = sub nsw i32 64, %x
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%sh_prom12.i = zext i32 %sub9 to i64
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%shr.i = ashr i64 %y, %sh_prom12.i
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ret i64 %shr.i
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}
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define i64 @test3(i64 %x, i64 %y) {
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; CHECK-LABEL: test3:
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; CHECK: // %bb.0:
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; CHECK-NEXT: lsl x0, x1, x0
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; CHECK-NEXT: ret
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%add = add nsw i64 64, %x
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%shl = shl i64 %y, %add
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ret i64 %shl
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}
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define i64 @test4(i64 %y, i32 %s) {
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; CHECK-LABEL: test4:
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; CHECK: // %bb.0: // %entry
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; CHECK-NEXT: // kill: def $w1 killed $w1 def $x1
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; CHECK-NEXT: asr x0, x0, x1
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; CHECK-NEXT: ret
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entry:
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%sh_prom = zext i32 %s to i64
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%shr = ashr i64 %y, %sh_prom
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ret i64 %shr
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}
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define i64 @test5(i64 %y, i32 %s) {
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; CHECK-LABEL: test5:
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; CHECK: // %bb.0: // %entry
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; CHECK-NEXT: // kill: def $w1 killed $w1 def $x1
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; CHECK-NEXT: asr x0, x0, x1
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; CHECK-NEXT: ret
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entry:
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%sh_prom = sext i32 %s to i64
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%shr = ashr i64 %y, %sh_prom
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ret i64 %shr
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}
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define i64 @test6(i64 %y, i32 %s) {
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; CHECK-LABEL: test6:
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; CHECK: // %bb.0: // %entry
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; CHECK-NEXT: // kill: def $w1 killed $w1 def $x1
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; CHECK-NEXT: lsl x0, x0, x1
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; CHECK-NEXT: ret
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entry:
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%sh_prom = sext i32 %s to i64
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%shr = shl i64 %y, %sh_prom
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ret i64 %shr
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}
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