mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-15 04:30:12 +00:00
af064aeee6
clobbers to forward pieces of large stores to small loads, we need to consider the properly phi translated pointer in the store block. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90978 91177308-0d34-0410-b5e6-96231b3b80d8
535 lines
11 KiB
LLVM
535 lines
11 KiB
LLVM
; RUN: opt < %s -gvn -S | FileCheck %s
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; 32-bit little endian target.
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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;; Trivial RLE test.
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define i32 @test0(i32 %V, i32* %P) {
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store i32 %V, i32* %P
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%A = load i32* %P
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ret i32 %A
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; CHECK: @test0
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; CHECK: ret i32 %V
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}
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;;===----------------------------------------------------------------------===;;
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;; Tests for crashers
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;;===----------------------------------------------------------------------===;;
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;; PR5016
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define i8 @crash0({i32, i32} %A, {i32, i32}* %P) {
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store {i32, i32} %A, {i32, i32}* %P
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%X = bitcast {i32, i32}* %P to i8*
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%Y = load i8* %X
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ret i8 %Y
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}
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;;===----------------------------------------------------------------------===;;
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;; Store -> Load and Load -> Load forwarding where src and dst are different
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;; types, but where the base pointer is a must alias.
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;;===----------------------------------------------------------------------===;;
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;; i32 -> f32 forwarding.
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define float @coerce_mustalias1(i32 %V, i32* %P) {
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store i32 %V, i32* %P
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%P2 = bitcast i32* %P to float*
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%A = load float* %P2
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ret float %A
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; CHECK: @coerce_mustalias1
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; CHECK-NOT: load
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; CHECK: ret float
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}
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;; i32* -> float forwarding.
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define float @coerce_mustalias2(i32* %V, i32** %P) {
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store i32* %V, i32** %P
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%P2 = bitcast i32** %P to float*
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%A = load float* %P2
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ret float %A
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; CHECK: @coerce_mustalias2
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; CHECK-NOT: load
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; CHECK: ret float
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}
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;; float -> i32* forwarding.
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define i32* @coerce_mustalias3(float %V, float* %P) {
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store float %V, float* %P
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%P2 = bitcast float* %P to i32**
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%A = load i32** %P2
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ret i32* %A
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; CHECK: @coerce_mustalias3
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; CHECK-NOT: load
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; CHECK: ret i32*
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}
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;; i32 -> f32 load forwarding.
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define float @coerce_mustalias4(i32* %P, i1 %cond) {
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%A = load i32* %P
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%P2 = bitcast i32* %P to float*
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%B = load float* %P2
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br i1 %cond, label %T, label %F
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T:
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ret float %B
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F:
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%X = bitcast i32 %A to float
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ret float %X
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; CHECK: @coerce_mustalias4
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; CHECK: %A = load i32* %P
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; CHECK-NOT: load
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; CHECK: ret float
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; CHECK: F:
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}
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;; i32 -> i8 forwarding
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define i8 @coerce_mustalias5(i32 %V, i32* %P) {
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store i32 %V, i32* %P
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%P2 = bitcast i32* %P to i8*
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%A = load i8* %P2
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ret i8 %A
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; CHECK: @coerce_mustalias5
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; CHECK-NOT: load
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; CHECK: ret i8
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}
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;; i64 -> float forwarding
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define float @coerce_mustalias6(i64 %V, i64* %P) {
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store i64 %V, i64* %P
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%P2 = bitcast i64* %P to float*
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%A = load float* %P2
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ret float %A
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; CHECK: @coerce_mustalias6
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; CHECK-NOT: load
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; CHECK: ret float
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}
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;; i64 -> i8* (32-bit) forwarding
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define i8* @coerce_mustalias7(i64 %V, i64* %P) {
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store i64 %V, i64* %P
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%P2 = bitcast i64* %P to i8**
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%A = load i8** %P2
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ret i8* %A
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; CHECK: @coerce_mustalias7
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; CHECK-NOT: load
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; CHECK: ret i8*
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}
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; memset -> i16 forwarding.
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define signext i16 @memset_to_i16_local(i16* %A) nounwind ssp {
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entry:
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%conv = bitcast i16* %A to i8*
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tail call void @llvm.memset.i64(i8* %conv, i8 1, i64 200, i32 1)
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%arrayidx = getelementptr inbounds i16* %A, i64 42
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%tmp2 = load i16* %arrayidx
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ret i16 %tmp2
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; CHECK: @memset_to_i16_local
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; CHECK-NOT: load
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; CHECK: ret i16 257
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}
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; memset -> float forwarding.
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define float @memset_to_float_local(float* %A, i8 %Val) nounwind ssp {
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entry:
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%conv = bitcast float* %A to i8* ; <i8*> [#uses=1]
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tail call void @llvm.memset.i64(i8* %conv, i8 %Val, i64 400, i32 1)
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%arrayidx = getelementptr inbounds float* %A, i64 42 ; <float*> [#uses=1]
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%tmp2 = load float* %arrayidx ; <float> [#uses=1]
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ret float %tmp2
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; CHECK: @memset_to_float_local
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; CHECK-NOT: load
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; CHECK: zext
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; CHECK-NEXT: shl
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; CHECK-NEXT: or
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; CHECK-NEXT: shl
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; CHECK-NEXT: or
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; CHECK-NEXT: bitcast
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; CHECK-NEXT: ret float
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}
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;; non-local memset -> i16 load forwarding.
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define i16 @memset_to_i16_nonlocal0(i16* %P, i1 %cond) {
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%P3 = bitcast i16* %P to i8*
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br i1 %cond, label %T, label %F
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T:
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tail call void @llvm.memset.i64(i8* %P3, i8 1, i64 400, i32 1)
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br label %Cont
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F:
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tail call void @llvm.memset.i64(i8* %P3, i8 2, i64 400, i32 1)
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br label %Cont
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Cont:
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%P2 = getelementptr i16* %P, i32 4
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%A = load i16* %P2
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ret i16 %A
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; CHECK: @memset_to_i16_nonlocal0
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; CHECK: Cont:
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; CHECK-NEXT: %A = phi i16 [ 514, %F ], [ 257, %T ]
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; CHECK-NOT: load
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; CHECK: ret i16 %A
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}
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@GCst = constant {i32, float, i32 } { i32 42, float 14., i32 97 }
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; memset -> float forwarding.
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define float @memcpy_to_float_local(float* %A) nounwind ssp {
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entry:
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%conv = bitcast float* %A to i8* ; <i8*> [#uses=1]
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tail call void @llvm.memcpy.i64(i8* %conv, i8* bitcast ({i32, float, i32 }* @GCst to i8*), i64 12, i32 1)
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%arrayidx = getelementptr inbounds float* %A, i64 1 ; <float*> [#uses=1]
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%tmp2 = load float* %arrayidx ; <float> [#uses=1]
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ret float %tmp2
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; CHECK: @memcpy_to_float_local
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; CHECK-NOT: load
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; CHECK: ret float 1.400000e+01
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}
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declare void @llvm.memset.i64(i8* nocapture, i8, i64, i32) nounwind
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declare void @llvm.memcpy.i64(i8* nocapture, i8* nocapture, i64, i32) nounwind
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;; non-local i32/float -> i8 load forwarding.
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define i8 @coerce_mustalias_nonlocal0(i32* %P, i1 %cond) {
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%P2 = bitcast i32* %P to float*
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%P3 = bitcast i32* %P to i8*
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br i1 %cond, label %T, label %F
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T:
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store i32 42, i32* %P
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br label %Cont
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F:
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store float 1.0, float* %P2
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br label %Cont
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Cont:
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%A = load i8* %P3
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ret i8 %A
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; CHECK: @coerce_mustalias_nonlocal0
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; CHECK: Cont:
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; CHECK: %A = phi i8 [
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; CHECK-NOT: load
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; CHECK: ret i8 %A
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}
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;; non-local i32/float -> i8 load forwarding. This also tests that the "P3"
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;; bitcast equivalence can be properly phi translated.
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define i8 @coerce_mustalias_nonlocal1(i32* %P, i1 %cond) {
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%P2 = bitcast i32* %P to float*
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br i1 %cond, label %T, label %F
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T:
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store i32 42, i32* %P
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br label %Cont
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F:
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store float 1.0, float* %P2
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br label %Cont
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Cont:
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%P3 = bitcast i32* %P to i8*
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%A = load i8* %P3
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ret i8 %A
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;; FIXME: This is disabled because this caused a miscompile in the llvm-gcc
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;; bootstrap, see r82411
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;
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; HECK: @coerce_mustalias_nonlocal1
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; HECK: Cont:
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; HECK: %A = phi i8 [
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; HECK-NOT: load
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; HECK: ret i8 %A
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}
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;; non-local i32 -> i8 partial redundancy load forwarding.
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define i8 @coerce_mustalias_pre0(i32* %P, i1 %cond) {
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%P3 = bitcast i32* %P to i8*
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br i1 %cond, label %T, label %F
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T:
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store i32 42, i32* %P
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br label %Cont
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F:
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br label %Cont
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Cont:
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%A = load i8* %P3
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ret i8 %A
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; CHECK: @coerce_mustalias_pre0
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; CHECK: F:
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; CHECK: load i8* %P3
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; CHECK: Cont:
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; CHECK: %A = phi i8 [
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; CHECK-NOT: load
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; CHECK: ret i8 %A
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}
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;;===----------------------------------------------------------------------===;;
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;; Store -> Load and Load -> Load forwarding where src and dst are different
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;; types, and the reload is an offset from the store pointer.
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;;===----------------------------------------------------------------------===;;
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;; i32 -> i8 forwarding.
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;; PR4216
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define i8 @coerce_offset0(i32 %V, i32* %P) {
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store i32 %V, i32* %P
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%P2 = bitcast i32* %P to i8*
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%P3 = getelementptr i8* %P2, i32 2
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%A = load i8* %P3
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ret i8 %A
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; CHECK: @coerce_offset0
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; CHECK-NOT: load
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; CHECK: ret i8
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}
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;; non-local i32/float -> i8 load forwarding.
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define i8 @coerce_offset_nonlocal0(i32* %P, i1 %cond) {
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%P2 = bitcast i32* %P to float*
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%P3 = bitcast i32* %P to i8*
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%P4 = getelementptr i8* %P3, i32 2
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br i1 %cond, label %T, label %F
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T:
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store i32 42, i32* %P
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br label %Cont
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F:
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store float 1.0, float* %P2
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br label %Cont
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Cont:
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%A = load i8* %P4
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ret i8 %A
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; CHECK: @coerce_offset_nonlocal0
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; CHECK: Cont:
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; CHECK: %A = phi i8 [
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; CHECK-NOT: load
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; CHECK: ret i8 %A
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}
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;; non-local i32 -> i8 partial redundancy load forwarding.
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define i8 @coerce_offset_pre0(i32* %P, i1 %cond) {
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%P3 = bitcast i32* %P to i8*
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%P4 = getelementptr i8* %P3, i32 2
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br i1 %cond, label %T, label %F
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T:
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store i32 42, i32* %P
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br label %Cont
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F:
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br label %Cont
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Cont:
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%A = load i8* %P4
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ret i8 %A
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; CHECK: @coerce_offset_pre0
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; CHECK: F:
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; CHECK: load i8* %P4
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; CHECK: Cont:
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; CHECK: %A = phi i8 [
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; CHECK-NOT: load
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; CHECK: ret i8 %A
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}
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define i32 @chained_load(i32** %p) {
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block1:
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%z = load i32** %p
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br i1 true, label %block2, label %block3
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block2:
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%a = load i32** %p
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br label %block4
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block3:
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%b = load i32** %p
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br label %block4
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block4:
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%c = load i32** %p
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%d = load i32* %c
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ret i32 %d
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; CHECK: @chained_load
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; CHECK: %z = load i32** %p
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; CHECK-NOT: load
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; CHECK: %d = load i32* %z
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; CHECK-NEXT: ret i32 %d
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}
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declare i1 @cond() readonly
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declare i1 @cond2() readonly
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define i32 @phi_trans2() {
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; CHECK: @phi_trans2
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entry:
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%P = alloca i32, i32 400
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br label %F1
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F1:
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%A = phi i32 [1, %entry], [2, %F]
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%cond2 = call i1 @cond()
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br i1 %cond2, label %T1, label %TY
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T1:
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%P2 = getelementptr i32* %P, i32 %A
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%x = load i32* %P2
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%cond = call i1 @cond2()
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br i1 %cond, label %TX, label %F
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F:
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%P3 = getelementptr i32* %P, i32 2
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store i32 17, i32* %P3
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store i32 42, i32* %P2 ; Provides "P[A]".
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br label %F1
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TX:
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; This load should not be compiled to 'ret i32 42'. An overly clever
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; implementation of GVN would see that we're returning 17 if the loop
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; executes once or 42 if it executes more than that, but we'd have to do
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; loop restructuring to expose this, and GVN shouldn't do this sort of CFG
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; transformation.
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; CHECK: TX:
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; CHECK: ret i32 %x
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ret i32 %x
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TY:
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ret i32 0
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}
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define i32 @phi_trans3(i32* %p) {
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; CHECK: @phi_trans3
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block1:
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br i1 true, label %block2, label %block3
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block2:
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store i32 87, i32* %p
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br label %block4
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block3:
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%p2 = getelementptr i32* %p, i32 43
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store i32 97, i32* %p2
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br label %block4
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block4:
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%A = phi i32 [-1, %block2], [42, %block3]
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br i1 true, label %block5, label %exit
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; CHECK: block4:
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; CHECK-NEXT: %D = phi i32 [ 87, %block2 ], [ 97, %block3 ]
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; CHECK-NOT: load
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block5:
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%B = add i32 %A, 1
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br i1 true, label %block6, label %exit
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block6:
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%C = getelementptr i32* %p, i32 %B
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br i1 true, label %block7, label %exit
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block7:
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%D = load i32* %C
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ret i32 %D
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; CHECK: block7:
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; CHECK-NEXT: ret i32 %D
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exit:
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ret i32 -1
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}
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define i8 @phi_trans4(i8* %p) {
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; CHECK: @phi_trans4
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entry:
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%X3 = getelementptr i8* %p, i32 192
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store i8 192, i8* %X3
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%X = getelementptr i8* %p, i32 4
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%Y = load i8* %X
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br label %loop
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loop:
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%i = phi i32 [4, %entry], [192, %loop]
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%X2 = getelementptr i8* %p, i32 %i
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%Y2 = load i8* %X2
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; CHECK: loop:
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; CHECK-NEXT: %Y2 = phi i8 [ %Y, %entry ], [ 0, %loop ]
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; CHECK-NOT: load i8
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%cond = call i1 @cond2()
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%Z = bitcast i8 *%X3 to i32*
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store i32 0, i32* %Z
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br i1 %cond, label %loop, label %out
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out:
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%R = add i8 %Y, %Y2
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ret i8 %R
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}
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define i8 @phi_trans5(i8* %p) {
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; CHECK: @phi_trans5
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entry:
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%X4 = getelementptr i8* %p, i32 2
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store i8 19, i8* %X4
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%X = getelementptr i8* %p, i32 4
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%Y = load i8* %X
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br label %loop
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loop:
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%i = phi i32 [4, %entry], [3, %cont]
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%X2 = getelementptr i8* %p, i32 %i
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%Y2 = load i8* %X2 ; Ensure this load is not being incorrectly replaced.
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%cond = call i1 @cond2()
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br i1 %cond, label %cont, label %out
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cont:
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%Z = getelementptr i8* %X2, i32 -1
|
|
%Z2 = bitcast i8 *%Z to i32*
|
|
store i32 50462976, i32* %Z2 ;; (1 << 8) | (2 << 16) | (3 << 24)
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|
|
; CHECK: store i32
|
|
; CHECK-NEXT: getelementptr i8* %p, i32 3
|
|
; CHECK-NEXT: load i8*
|
|
br label %loop
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|
out:
|
|
%R = add i8 %Y, %Y2
|
|
ret i8 %R
|
|
}
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