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c87c50a39c
common cases. This triggers a surprising number of times in SPEC2K6 because min/max idioms end up doing this. For example, code from the STL ends up looking like this to SRoA: %202 = load i64* %__old_size, align 8, !tbaa !3 %203 = load i64* %__old_size, align 8, !tbaa !3 %204 = load i64* %__n, align 8, !tbaa !3 %205 = icmp ult i64 %203, %204 %storemerge.i = select i1 %205, i64* %__n, i64* %__old_size %206 = load i64* %storemerge.i, align 8, !tbaa !3 We can now promote both the __n and the __old_size allocas. This addresses another chunk of rdar://7339113, poor codegen on stringswitch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124088 91177308-0d34-0410-b5e6-96231b3b80d8
133 lines
3.5 KiB
LLVM
133 lines
3.5 KiB
LLVM
; RUN: opt %s -scalarrepl -S | FileCheck %s
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; Test promotion of allocas that have phis and select users.
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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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target triple = "x86_64-apple-darwin10.2"
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%struct.X = type { i32 }
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%PairTy = type {i32, i32}
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; CHECK: @test1
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; CHECK: %a.0 = alloca i32
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; CHECK: %b.0 = alloca i32
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define i32 @test1(i32 %x) nounwind readnone ssp {
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entry:
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%a = alloca %struct.X, align 8 ; <%struct.X*> [#uses=2]
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%b = alloca %struct.X, align 8 ; <%struct.X*> [#uses=2]
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%0 = getelementptr inbounds %struct.X* %a, i64 0, i32 0 ; <i32*> [#uses=1]
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store i32 1, i32* %0, align 8
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%1 = getelementptr inbounds %struct.X* %b, i64 0, i32 0 ; <i32*> [#uses=1]
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store i32 2, i32* %1, align 8
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%2 = icmp eq i32 %x, 0 ; <i1> [#uses=1]
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%p.0 = select i1 %2, %struct.X* %b, %struct.X* %a ; <%struct.X*> [#uses=1]
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%3 = getelementptr inbounds %struct.X* %p.0, i64 0, i32 0 ; <i32*> [#uses=1]
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%4 = load i32* %3, align 8 ; <i32> [#uses=1]
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ret i32 %4
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}
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; CHECK: @test2
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; CHECK: %A.0 = alloca i32
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; CHECK: %A.1 = alloca i32
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define i32 @test2(i1 %c) {
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entry:
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%A = alloca {i32, i32}
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%B = getelementptr {i32, i32}* %A, i32 0, i32 0
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store i32 1, i32* %B
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br i1 %c, label %T, label %F
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T:
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%C = getelementptr {i32, i32}* %A, i32 0, i32 1
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store i32 2, i32* %B
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br label %F
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F:
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%X = phi i32* [%B, %entry], [%C, %T]
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%Q = load i32* %X
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ret i32 %Q
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}
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; CHECK: @test3
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; CHECK-NEXT: %Q = select i1 %c, i32 1, i32 2
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; CHECK-NEXT: ret i32 %Q
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; rdar://8904039
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define i32 @test3(i1 %c) {
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%A = alloca {i32, i32}
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%B = getelementptr {i32, i32}* %A, i32 0, i32 0
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store i32 1, i32* %B
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%C = getelementptr {i32, i32}* %A, i32 0, i32 1
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store i32 2, i32* %C
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%X = select i1 %c, i32* %B, i32* %C
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%Q = load i32* %X
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ret i32 %Q
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}
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;; We can't scalarize this, a use of the select is not an element access.
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define i64 @test4(i1 %c) {
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entry:
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%A = alloca %PairTy
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; CHECK: @test4
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; CHECK: %A = alloca %PairTy
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%B = getelementptr {i32, i32}* %A, i32 0, i32 0
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store i32 1, i32* %B
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%C = getelementptr {i32, i32}* %A, i32 0, i32 1
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store i32 2, i32* %B
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%X = select i1 %c, i32* %B, i32* %C
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%Y = bitcast i32* %X to i64*
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%Q = load i64* %Y
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ret i64 %Q
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}
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;;
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;; Tests for promoting allocas used by selects.
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;; rdar://7339113
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;;
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define i32 @test5(i32 *%P) nounwind readnone ssp {
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entry:
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%b = alloca i32, align 8
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store i32 2, i32* %b, align 8
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;; Select on constant condition should be folded.
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%p.0 = select i1 false, i32* %b, i32* %P
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store i32 123, i32* %p.0
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%r = load i32* %b, align 8
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ret i32 %r
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; CHECK: @test5
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; CHECK: store i32 123, i32* %P
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; CHECK: ret i32 2
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}
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define i32 @test6(i32 %x, i1 %c) nounwind readnone ssp {
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%a = alloca i32, align 8
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%b = alloca i32, align 8
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store i32 1, i32* %a, align 8
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store i32 2, i32* %b, align 8
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%p.0 = select i1 %c, i32* %b, i32* %a
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%r = load i32* %p.0, align 8
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ret i32 %r
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; CHECK: @test6
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; CHECK-NEXT: %r = select i1 %c, i32 2, i32 1
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; CHECK-NEXT: ret i32 %r
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}
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; Verify that the loads happen where the loads are, not where the select is.
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define i32 @test7(i32 %x, i1 %c) nounwind readnone ssp {
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%a = alloca i32, align 8
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%b = alloca i32, align 8
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store i32 1, i32* %a
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store i32 2, i32* %b
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%p.0 = select i1 %c, i32* %b, i32* %a
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store i32 0, i32* %a
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%r = load i32* %p.0, align 8
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ret i32 %r
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; CHECK: @test7
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; CHECK-NOT: alloca i32
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; CHECK: %r = select i1 %c, i32 2, i32 0
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; CHECK: ret i32 %r
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}
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