mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-05 13:30:38 +00:00
e3357863aa
occurs because instcombine sinks loads and inserts phis. This kicks in on such apps as 175.vpr, eon, 403.gcc, xalancbmk and a bunch of times in spec2006 in some app that uses std::deque. This resolves the last of rdar://7339113. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124090 91177308-0d34-0410-b5e6-96231b3b80d8
154 lines
4.1 KiB
LLVM
154 lines
4.1 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: %X.ld = phi i32 [ 1, %entry ], [ 2, %T ]
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; CHECK-NEXT: ret i32 %X.ld
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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* %C
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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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;; Promote allocs that are PHI'd together by moving the loads.
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define i32 @test8(i32 %x) nounwind readnone ssp {
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; CHECK: @test8
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; CHECK-NOT: load i32
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; CHECK-NOT: store i32
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; CHECK: %p.0.ld = phi i32 [ 2, %entry ], [ 1, %T ]
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; CHECK-NEXT: ret i32 %p.0.ld
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entry:
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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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%c = icmp eq i32 %x, 0
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br i1 %c, label %T, label %Cont
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T:
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br label %Cont
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Cont:
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%p.0 = phi i32* [%b, %entry],[%a, %T]
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%r = load i32* %p.0, align 8
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ret i32 %r
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}
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