mirror of
https://github.com/RPCS3/llvm.git
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03e091f0b5
properly with how the code handles all-undef PHI nodes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155721 91177308-0d34-0410-b5e6-96231b3b80d8
633 lines
15 KiB
LLVM
633 lines
15 KiB
LLVM
; This test makes sure that these instructions are properly eliminated.
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;
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; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128:n8:16:32:64"
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define i32 @test1(i32 %A, i1 %b) {
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BB0:
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br i1 %b, label %BB1, label %BB2
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BB1:
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; Combine away one argument PHI nodes
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%B = phi i32 [ %A, %BB0 ]
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ret i32 %B
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BB2:
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ret i32 %A
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; CHECK: @test1
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; CHECK: BB1:
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; CHECK-NEXT: ret i32 %A
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}
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define i32 @test2(i32 %A, i1 %b) {
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BB0:
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br i1 %b, label %BB1, label %BB2
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BB1:
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br label %BB2
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BB2:
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; Combine away PHI nodes with same values
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%B = phi i32 [ %A, %BB0 ], [ %A, %BB1 ]
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ret i32 %B
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; CHECK: @test2
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; CHECK: BB2:
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; CHECK-NEXT: ret i32 %A
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}
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define i32 @test3(i32 %A, i1 %b) {
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BB0:
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br label %Loop
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Loop:
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; PHI has same value always.
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%B = phi i32 [ %A, %BB0 ], [ %B, %Loop ]
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br i1 %b, label %Loop, label %Exit
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Exit:
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ret i32 %B
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; CHECK: @test3
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; CHECK: Exit:
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; CHECK-NEXT: ret i32 %A
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}
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define i32 @test4(i1 %b) {
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BB0:
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; Loop is unreachable
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ret i32 7
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Loop: ; preds = %L2, %Loop
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; PHI has same value always.
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%B = phi i32 [ %B, %L2 ], [ %B, %Loop ]
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br i1 %b, label %L2, label %Loop
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L2: ; preds = %Loop
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br label %Loop
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; CHECK: @test4
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; CHECK: Loop:
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; CHECK-NEXT: br i1 %b
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}
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define i32 @test5(i32 %A, i1 %b) {
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BB0:
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br label %Loop
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Loop: ; preds = %Loop, %BB0
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; PHI has same value always.
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%B = phi i32 [ %A, %BB0 ], [ undef, %Loop ]
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br i1 %b, label %Loop, label %Exit
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Exit: ; preds = %Loop
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ret i32 %B
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; CHECK: @test5
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; CHECK: Loop:
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; CHECK-NEXT: br i1 %b
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; CHECK: Exit:
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; CHECK-NEXT: ret i32 %A
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}
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define i32 @test6(i16 %A, i1 %b) {
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BB0:
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%X = zext i16 %A to i32
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br i1 %b, label %BB1, label %BB2
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BB1:
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%Y = zext i16 %A to i32
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br label %BB2
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BB2:
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;; Suck casts into phi
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%B = phi i32 [ %X, %BB0 ], [ %Y, %BB1 ]
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ret i32 %B
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; CHECK: @test6
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; CHECK: BB2:
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; CHECK: zext i16 %A to i32
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; CHECK-NEXT: ret i32
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}
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define i32 @test7(i32 %A, i1 %b) {
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BB0:
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br label %Loop
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Loop: ; preds = %Loop, %BB0
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; PHI is dead.
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%B = phi i32 [ %A, %BB0 ], [ %C, %Loop ]
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%C = add i32 %B, 123
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br i1 %b, label %Loop, label %Exit
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Exit: ; preds = %Loop
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ret i32 0
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; CHECK: @test7
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; CHECK: Loop:
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; CHECK-NEXT: br i1 %b
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}
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define i32* @test8({ i32, i32 } *%A, i1 %b) {
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BB0:
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%X = getelementptr inbounds { i32, i32 } *%A, i32 0, i32 1
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br i1 %b, label %BB1, label %BB2
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BB1:
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%Y = getelementptr { i32, i32 } *%A, i32 0, i32 1
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br label %BB2
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BB2:
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;; Suck GEPs into phi
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%B = phi i32* [ %X, %BB0 ], [ %Y, %BB1 ]
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ret i32* %B
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; CHECK: @test8
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; CHECK-NOT: phi
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; CHECK: BB2:
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; CHECK-NEXT: %B = getelementptr { i32, i32 }* %A
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; CHECK-NEXT: ret i32* %B
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}
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define i32 @test9(i32* %A, i32* %B) {
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entry:
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%c = icmp eq i32* %A, null
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br i1 %c, label %bb1, label %bb
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bb:
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%C = load i32* %B, align 1
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br label %bb2
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bb1:
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%D = load i32* %A, align 1
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br label %bb2
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bb2:
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%E = phi i32 [ %C, %bb ], [ %D, %bb1 ]
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ret i32 %E
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; CHECK: @test9
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; CHECK: bb2:
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; CHECK-NEXT: phi i32* [ %B, %bb ], [ %A, %bb1 ]
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; CHECK-NEXT: %E = load i32* %{{[^,]*}}, align 1
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; CHECK-NEXT: ret i32 %E
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}
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define i32 @test10(i32* %A, i32* %B) {
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entry:
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%c = icmp eq i32* %A, null
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br i1 %c, label %bb1, label %bb
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bb:
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%C = load i32* %B, align 16
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br label %bb2
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bb1:
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%D = load i32* %A, align 32
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br label %bb2
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bb2:
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%E = phi i32 [ %C, %bb ], [ %D, %bb1 ]
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ret i32 %E
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; CHECK: @test10
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; CHECK: bb2:
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; CHECK-NEXT: phi i32* [ %B, %bb ], [ %A, %bb1 ]
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; CHECK-NEXT: %E = load i32* %{{[^,]*}}, align 16
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; CHECK-NEXT: ret i32 %E
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}
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; PR1777
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declare i1 @test11a()
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define i1 @test11() {
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entry:
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%a = alloca i32
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%i = ptrtoint i32* %a to i64
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%b = call i1 @test11a()
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br i1 %b, label %one, label %two
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one:
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%x = phi i64 [%i, %entry], [%y, %two]
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%c = call i1 @test11a()
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br i1 %c, label %two, label %end
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two:
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%y = phi i64 [%i, %entry], [%x, %one]
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%d = call i1 @test11a()
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br i1 %d, label %one, label %end
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end:
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%f = phi i64 [ %x, %one], [%y, %two]
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; Change the %f to %i, and the optimizer suddenly becomes a lot smarter
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; even though %f must equal %i at this point
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%g = inttoptr i64 %f to i32*
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store i32 10, i32* %g
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%z = call i1 @test11a()
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ret i1 %z
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; CHECK: @test11
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; CHECK-NOT: phi i32
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; CHECK: ret i1 %z
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}
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define i64 @test12(i1 %cond, i8* %Ptr, i64 %Val) {
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entry:
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%tmp41 = ptrtoint i8* %Ptr to i64
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%tmp42 = zext i64 %tmp41 to i128
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br i1 %cond, label %end, label %two
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two:
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%tmp36 = zext i64 %Val to i128 ; <i128> [#uses=1]
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%tmp37 = shl i128 %tmp36, 64 ; <i128> [#uses=1]
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%ins39 = or i128 %tmp42, %tmp37 ; <i128> [#uses=1]
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br label %end
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end:
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%tmp869.0 = phi i128 [ %tmp42, %entry ], [ %ins39, %two ]
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%tmp32 = trunc i128 %tmp869.0 to i64 ; <i64> [#uses=1]
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%tmp29 = lshr i128 %tmp869.0, 64 ; <i128> [#uses=1]
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%tmp30 = trunc i128 %tmp29 to i64 ; <i64> [#uses=1]
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%tmp2 = add i64 %tmp32, %tmp30
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ret i64 %tmp2
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; CHECK: @test12
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; CHECK-NOT: zext
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; CHECK: end:
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; CHECK-NEXT: phi i64 [ 0, %entry ], [ %Val, %two ]
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; CHECK-NOT: phi
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; CHECK: ret i64
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}
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declare void @test13f(double, i32)
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define void @test13(i1 %cond, i32 %V1, double %Vald) {
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entry:
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%tmp42 = zext i32 %V1 to i128
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br i1 %cond, label %end, label %two
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two:
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%Val = bitcast double %Vald to i64
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%tmp36 = zext i64 %Val to i128 ; <i128> [#uses=1]
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%tmp37 = shl i128 %tmp36, 64 ; <i128> [#uses=1]
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%ins39 = or i128 %tmp42, %tmp37 ; <i128> [#uses=1]
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br label %end
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end:
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%tmp869.0 = phi i128 [ %tmp42, %entry ], [ %ins39, %two ]
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%tmp32 = trunc i128 %tmp869.0 to i32
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%tmp29 = lshr i128 %tmp869.0, 64 ; <i128> [#uses=1]
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%tmp30 = trunc i128 %tmp29 to i64 ; <i64> [#uses=1]
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%tmp31 = bitcast i64 %tmp30 to double
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call void @test13f(double %tmp31, i32 %tmp32)
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ret void
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; CHECK: @test13
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; CHECK-NOT: zext
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; CHECK: end:
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; CHECK-NEXT: phi double [ 0.000000e+00, %entry ], [ %Vald, %two ]
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; CHECK-NEXT: call void @test13f(double {{[^,]*}}, i32 %V1)
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; CHECK: ret void
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}
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define i640 @test14a(i320 %A, i320 %B, i1 %b1) {
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BB0:
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%a = zext i320 %A to i640
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%b = zext i320 %B to i640
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br label %Loop
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Loop:
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%C = phi i640 [ %a, %BB0 ], [ %b, %Loop ]
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br i1 %b1, label %Loop, label %Exit
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Exit: ; preds = %Loop
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ret i640 %C
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; CHECK: @test14a
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; CHECK: Loop:
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; CHECK-NEXT: phi i320
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}
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define i160 @test14b(i320 %A, i320 %B, i1 %b1) {
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BB0:
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%a = trunc i320 %A to i160
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%b = trunc i320 %B to i160
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br label %Loop
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Loop:
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%C = phi i160 [ %a, %BB0 ], [ %b, %Loop ]
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br i1 %b1, label %Loop, label %Exit
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Exit: ; preds = %Loop
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ret i160 %C
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; CHECK: @test14b
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; CHECK: Loop:
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; CHECK-NEXT: phi i160
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}
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declare i64 @test15a(i64)
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define i64 @test15b(i64 %A, i1 %b) {
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; CHECK: @test15b
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entry:
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%i0 = zext i64 %A to i128
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%i1 = shl i128 %i0, 64
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%i = or i128 %i1, %i0
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br i1 %b, label %one, label %two
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; CHECK: entry:
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; CHECK-NEXT: br i1 %b
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one:
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%x = phi i128 [%i, %entry], [%y, %two]
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%x1 = lshr i128 %x, 64
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%x2 = trunc i128 %x1 to i64
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%c = call i64 @test15a(i64 %x2)
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%c1 = zext i64 %c to i128
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br label %two
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; CHECK: one:
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; CHECK-NEXT: phi i64
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; CHECK-NEXT: %c = call i64 @test15a
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two:
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%y = phi i128 [%i, %entry], [%c1, %one]
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%y1 = lshr i128 %y, 64
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%y2 = trunc i128 %y1 to i64
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%d = call i64 @test15a(i64 %y2)
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%d1 = trunc i64 %d to i1
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br i1 %d1, label %one, label %end
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; CHECK: two:
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; CHECK-NEXT: phi i64
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; CHECK-NEXT: phi i64
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; CHECK-NEXT: %d = call i64 @test15a
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end:
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%g = trunc i128 %y to i64
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ret i64 %g
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; CHECK: end:
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; CHECK-NEXT: ret i64
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}
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; PR6512 - Shouldn't merge loads from different addr spaces.
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define i32 @test16(i32 addrspace(1)* %pointer1, i32 %flag, i32* %pointer2)
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nounwind {
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entry:
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%retval = alloca i32, align 4 ; <i32*> [#uses=2]
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%pointer1.addr = alloca i32 addrspace(1)*, align 4 ; <i32 addrspace(1)**>
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%flag.addr = alloca i32, align 4 ; <i32*> [#uses=2]
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%pointer2.addr = alloca i32*, align 4 ; <i32**> [#uses=2]
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%res = alloca i32, align 4 ; <i32*> [#uses=4]
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store i32 addrspace(1)* %pointer1, i32 addrspace(1)** %pointer1.addr
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store i32 %flag, i32* %flag.addr
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store i32* %pointer2, i32** %pointer2.addr
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store i32 10, i32* %res
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%tmp = load i32* %flag.addr ; <i32> [#uses=1]
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%tobool = icmp ne i32 %tmp, 0 ; <i1> [#uses=1]
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br i1 %tobool, label %if.then, label %if.else
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return: ; preds = %if.end
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%tmp7 = load i32* %retval ; <i32> [#uses=1]
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ret i32 %tmp7
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if.end: ; preds = %if.else, %if.then
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%tmp6 = load i32* %res ; <i32> [#uses=1]
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store i32 %tmp6, i32* %retval
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br label %return
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if.then: ; preds = %entry
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%tmp1 = load i32 addrspace(1)** %pointer1.addr ; <i32 addrspace(1)*>
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%arrayidx = getelementptr i32 addrspace(1)* %tmp1, i32 0 ; <i32 addrspace(1)*> [#uses=1]
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%tmp2 = load i32 addrspace(1)* %arrayidx ; <i32> [#uses=1]
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store i32 %tmp2, i32* %res
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br label %if.end
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if.else: ; preds = %entry
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%tmp3 = load i32** %pointer2.addr ; <i32*> [#uses=1]
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%arrayidx4 = getelementptr i32* %tmp3, i32 0 ; <i32*> [#uses=1]
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%tmp5 = load i32* %arrayidx4 ; <i32> [#uses=1]
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store i32 %tmp5, i32* %res
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br label %if.end
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}
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; PR4413
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declare i32 @ext()
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; CHECK: @test17
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define i32 @test17(i1 %a) {
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entry:
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br i1 %a, label %bb1, label %bb2
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bb1: ; preds = %entry
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%0 = tail call i32 @ext() ; <i32> [#uses=1]
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br label %bb2
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bb2: ; preds = %bb1, %entry
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%cond = phi i1 [ true, %bb1 ], [ false, %entry ] ; <i1> [#uses=1]
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; CHECK-NOT: %val = phi i32 [ %0, %bb1 ], [ 0, %entry ]
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%val = phi i32 [ %0, %bb1 ], [ 0, %entry ] ; <i32> [#uses=1]
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%res = select i1 %cond, i32 %val, i32 0 ; <i32> [#uses=1]
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; CHECK: ret i32 %cond
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ret i32 %res
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}
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define i1 @test18(i1 %cond) {
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%zero = alloca i32
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%one = alloca i32
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br i1 %cond, label %true, label %false
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true:
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br label %ret
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false:
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br label %ret
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ret:
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%ptr = phi i32* [ %zero, %true ] , [ %one, %false ]
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%isnull = icmp eq i32* %ptr, null
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ret i1 %isnull
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; CHECK: @test18
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; CHECK: ret i1 false
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}
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define i1 @test19(i1 %cond, double %x) {
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br i1 %cond, label %true, label %false
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true:
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br label %ret
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false:
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br label %ret
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ret:
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%p = phi double [ %x, %true ], [ 0x7FF0000000000000, %false ]; RHS = +infty
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%cmp = fcmp ule double %x, %p
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ret i1 %cmp
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; CHECK: @test19
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; CHECK: ret i1 true
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}
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define i1 @test20(i1 %cond) {
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%a = alloca i32
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%b = alloca i32
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%c = alloca i32
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br i1 %cond, label %true, label %false
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true:
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br label %ret
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false:
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br label %ret
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ret:
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%p = phi i32* [ %a, %true ], [ %b, %false ]
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%r = icmp eq i32* %p, %c
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ret i1 %r
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; CHECK: @test20
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; CHECK: ret i1 false
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}
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define i1 @test21(i1 %c1, i1 %c2) {
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%a = alloca i32
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%b = alloca i32
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%c = alloca i32
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br i1 %c1, label %true, label %false
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true:
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br label %loop
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false:
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br label %loop
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loop:
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%p = phi i32* [ %a, %true ], [ %b, %false ], [ %p, %loop ]
|
|
%r = icmp eq i32* %p, %c
|
|
br i1 %c2, label %ret, label %loop
|
|
ret:
|
|
ret i1 %r
|
|
; CHECK: @test21
|
|
; CHECK: ret i1 false
|
|
}
|
|
|
|
define void @test22() {
|
|
; CHECK: @test22
|
|
entry:
|
|
br label %loop
|
|
loop:
|
|
%phi = phi i32 [ 0, %entry ], [ %y, %loop ]
|
|
%y = add i32 %phi, 1
|
|
%o = or i32 %y, %phi
|
|
%e = icmp eq i32 %o, %y
|
|
br i1 %e, label %loop, label %ret
|
|
; CHECK: br i1 %e
|
|
ret:
|
|
ret void
|
|
}
|
|
|
|
define i32 @test23(i32 %A, i1 %b, i32 * %P) {
|
|
BB0:
|
|
br label %Loop
|
|
|
|
Loop: ; preds = %Loop, %BB0
|
|
; PHI has same value always.
|
|
%B = phi i32 [ %A, %BB0 ], [ 42, %Loop ]
|
|
%D = add i32 %B, 19
|
|
store i32 %D, i32* %P
|
|
br i1 %b, label %Loop, label %Exit
|
|
|
|
Exit: ; preds = %Loop
|
|
%E = add i32 %B, 19
|
|
ret i32 %E
|
|
; CHECK: @test23
|
|
; CHECK: %phitmp = add i32 %A, 19
|
|
; CHECK: Loop:
|
|
; CHECK-NEXT: %B = phi i32 [ %phitmp, %BB0 ], [ 61, %Loop ]
|
|
; CHECK: Exit:
|
|
; CHECK-NEXT: ret i32 %B
|
|
}
|
|
|
|
define i32 @test24(i32 %A, i1 %cond) {
|
|
BB0:
|
|
%X = add nuw nsw i32 %A, 1
|
|
br i1 %cond, label %BB1, label %BB2
|
|
|
|
BB1:
|
|
%Y = add nuw i32 %A, 1
|
|
br label %BB2
|
|
|
|
BB2:
|
|
%C = phi i32 [ %X, %BB0 ], [ %Y, %BB1 ]
|
|
ret i32 %C
|
|
; CHECK: @test24
|
|
; CHECK-NOT: phi
|
|
; CHECK: BB2:
|
|
; CHECK-NEXT: %C = add nuw i32 %A, 1
|
|
; CHECK-NEXT: ret i32 %C
|
|
}
|
|
|
|
; Same as test11, but used to be missed due to a bug.
|
|
declare i1 @test25a()
|
|
|
|
define i1 @test25() {
|
|
entry:
|
|
%a = alloca i32
|
|
%i = ptrtoint i32* %a to i64
|
|
%b = call i1 @test25a()
|
|
br i1 %b, label %one, label %two
|
|
|
|
one:
|
|
%x = phi i64 [%y, %two], [%i, %entry]
|
|
%c = call i1 @test25a()
|
|
br i1 %c, label %two, label %end
|
|
|
|
two:
|
|
%y = phi i64 [%x, %one], [%i, %entry]
|
|
%d = call i1 @test25a()
|
|
br i1 %d, label %one, label %end
|
|
|
|
end:
|
|
%f = phi i64 [ %x, %one], [%y, %two]
|
|
; Change the %f to %i, and the optimizer suddenly becomes a lot smarter
|
|
; even though %f must equal %i at this point
|
|
%g = inttoptr i64 %f to i32*
|
|
store i32 10, i32* %g
|
|
%z = call i1 @test25a()
|
|
ret i1 %z
|
|
; CHECK: @test25
|
|
; CHECK-NOT: phi i32
|
|
; CHECK: ret i1 %z
|
|
}
|
|
|
|
declare i1 @test26a()
|
|
|
|
define i1 @test26(i32 %n) {
|
|
entry:
|
|
%a = alloca i32
|
|
%i = ptrtoint i32* %a to i64
|
|
%b = call i1 @test26a()
|
|
br label %one
|
|
|
|
one:
|
|
%x = phi i64 [%y, %two], [%w, %three], [%i, %entry]
|
|
%c = call i1 @test26a()
|
|
switch i32 %n, label %end [
|
|
i32 2, label %two
|
|
i32 3, label %three
|
|
]
|
|
|
|
two:
|
|
%y = phi i64 [%x, %one], [%w, %three]
|
|
%d = call i1 @test26a()
|
|
switch i32 %n, label %end [
|
|
i32 10, label %one
|
|
i32 30, label %three
|
|
]
|
|
|
|
three:
|
|
%w = phi i64 [%y, %two], [%x, %one]
|
|
%e = call i1 @test26a()
|
|
br i1 %e, label %one, label %two
|
|
|
|
end:
|
|
%f = phi i64 [ %x, %one], [%y, %two]
|
|
; Change the %f to %i, and the optimizer suddenly becomes a lot smarter
|
|
; even though %f must equal %i at this point
|
|
%g = inttoptr i64 %f to i32*
|
|
store i32 10, i32* %g
|
|
%z = call i1 @test26a()
|
|
ret i1 %z
|
|
; CHECK: @test26
|
|
; CHECK-NOT: phi i32
|
|
; CHECK: ret i1 %z
|
|
}
|
|
|
|
; CHECK: @test27(
|
|
; CHECK: ret i32 undef
|
|
define i32 @test27(i1 %b) {
|
|
entry:
|
|
br label %done
|
|
done:
|
|
%y = phi i32 [ undef, %entry ]
|
|
ret i32 %y
|
|
}
|