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https://github.com/RPCS3/llvm-mirror.git
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e0937686e0
As discussed on PR50183, we already fold to prefer 'select-of-idx' vs 'select-of-gep':
define <4 x i32>* @select0a(<4 x i32>* %a0, i64 %a1, i1 %a2, i64 %a3) {
%gep0 = getelementptr inbounds <4 x i32>, <4 x i32>* %a0, i64 %a1
%gep1 = getelementptr inbounds <4 x i32>, <4 x i32>* %a0, i64 %a3
%sel = select i1 %a2, <4 x i32>* %gep0, <4 x i32>* %gep1
ret <4 x i32>* %sel
}
-->
define <4 x i32>* @select1a(<4 x i32>* %a0, i64 %a1, i1 %a2, i64 %a3) {
%sel = select i1 %a2, i64 %a1, i64 %a3
%gep = getelementptr inbounds <4 x i32>, <4 x i32>* %a0, i64 %sel
ret <4 x i32>* %gep
}
This patch adds basic handling for the 'fallthrough' cases where the gep idx == 0 has been folded away to the base address:
define <4 x i32>* @select0(<4 x i32>* %a0, i64 %a1, i1 %a2) {
%gep = getelementptr inbounds <4 x i32>, <4 x i32>* %a0, i64 %a1
%sel = select i1 %a2, <4 x i32>* %a0, <4 x i32>* %gep
ret <4 x i32>* %sel
}
-->
define <4 x i32>* @select1(<4 x i32>* %a0, i64 %a1, i1 %a2) {
%sel = select i1 %a2, i64 0, i64 %a1
%gep = getelementptr inbounds <4 x i32>, <4 x i32>* %a0, i64 %sel
ret <4 x i32>* %gep
}
Reapplied with a fix for the bpf "-bpf-disable-avoid-speculation" tests
Differential Revision: https://reviews.llvm.org/D105901
85 lines
3.3 KiB
LLVM
85 lines
3.3 KiB
LLVM
; RUN: opt -O2 -mtriple=bpf-pc-linux %s | llvm-dis > %t1
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; RUN: llc %t1 -o - | FileCheck -check-prefixes=CHECK-COMMON,CHECK %s
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; RUN: opt -O2 -mtriple=bpf-pc-linux -bpf-disable-avoid-speculation %s | llvm-dis > %t1
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; RUN: llc %t1 -o - | FileCheck -check-prefixes=CHECK-COMMON,CHECK-DISABLE %s
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;
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; Source:
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; unsigned long foo();
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; void *test(void *p) {
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; unsigned long ret = foo();
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; if (ret <= 7)
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; p += ret;
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; return p;
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; }
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; Compilation flag:
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; clang -target bpf -O2 -S -emit-llvm -Xclang -disable-llvm-passes test.c
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; Function Attrs: nounwind
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define dso_local i8* @test(i8* %p) #0 {
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entry:
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%p.addr = alloca i8*, align 8
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%ret = alloca i64, align 8
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store i8* %p, i8** %p.addr, align 8, !tbaa !2
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%0 = bitcast i64* %ret to i8*
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call void @llvm.lifetime.start.p0i8(i64 8, i8* %0) #3
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%call = call i64 bitcast (i64 (...)* @foo to i64 ()*)()
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store i64 %call, i64* %ret, align 8, !tbaa !6
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%1 = load i64, i64* %ret, align 8, !tbaa !6
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%cmp = icmp ule i64 %1, 7
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br i1 %cmp, label %if.then, label %if.end
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if.then: ; preds = %entry
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%2 = load i64, i64* %ret, align 8, !tbaa !6
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%3 = load i8*, i8** %p.addr, align 8, !tbaa !2
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%add.ptr = getelementptr i8, i8* %3, i64 %2
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store i8* %add.ptr, i8** %p.addr, align 8, !tbaa !2
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br label %if.end
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if.end: ; preds = %if.then, %entry
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%4 = load i8*, i8** %p.addr, align 8, !tbaa !2
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%5 = bitcast i64* %ret to i8*
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call void @llvm.lifetime.end.p0i8(i64 8, i8* %5) #3
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ret i8* %4
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}
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; CHECK-COMMON: [[REG6:r[0-9]+]] = r1
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; CHECK-COMMON: call foo
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; CHECK: if r0 > 7 goto [[LABEL:.*]]
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; CHECK: [[REG6]] += r0
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; CHECK: [[LABEL]]:
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; CHECK: r0 = [[REG6]]
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; CHECK-DISABLE: [[REG1:r[0-9]+]] = 8
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; CHECK-DISABLE: if [[REG1]] > r0 goto [[LABEL:.*]]
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; CHECK-DISABLE: r0 = 0
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; CHECK-DISABLE: [[LABEL]]:
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; CHECK-DISABLE: [[REG6]] += r0
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; CHECK-DISABLE: r0 = [[REG6]]
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; CHECK-COMMON: exit
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; Function Attrs: argmemonly nounwind willreturn
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declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #1
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declare dso_local i64 @foo(...) #2
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; Function Attrs: argmemonly nounwind willreturn
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declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1
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attributes #0 = { nounwind "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { argmemonly nounwind willreturn }
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attributes #2 = { "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #3 = { nounwind }
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!llvm.module.flags = !{!0}
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!llvm.ident = !{!1}
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!0 = !{i32 1, !"wchar_size", i32 4}
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!1 = !{!"clang version 12.0.0 (https://github.com/llvm/llvm-project.git ca9c5433a6c31e372092fcd8bfd0e4fddd7e8784)"}
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!2 = !{!3, !3, i64 0}
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!3 = !{!"any pointer", !4, i64 0}
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!4 = !{!"omnipotent char", !5, i64 0}
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!5 = !{!"Simple C/C++ TBAA"}
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!6 = !{!7, !7, i64 0}
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!7 = !{!"long", !4, i64 0}
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