1e9afab875
It seems the crashes we saw wasn't caused by this (see comments on the review).
> This is basically D108837 but for jump threading. Free instructions
> should be ignored for the threading decision. JumpThreading already
> skips some free instructions (like pointer bitcasts), but does not
> skip various free intrinsics -- in fact, it currently gives them a
> fairly large cost of 2.
>
> Differential Revision: https://reviews.llvm.org/D110290
This reverts commit 4604695d7c.
67 lines
2.5 KiB
LLVM
67 lines
2.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -jump-threading -jump-threading-threshold=3 < %s | FileCheck %s
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; TODO: In this test case, only the stores in %join should cound towards
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; the jump threading threshold, as everything else are free instructions.
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define i32 @free_instructions(i1 %c, i32* %p) {
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; CHECK-LABEL: @free_instructions(
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; CHECK-NEXT: br i1 [[C:%.*]], label [[IF2:%.*]], label [[ELSE2:%.*]]
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; CHECK: if2:
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; CHECK-NEXT: store i32 -1, i32* [[P:%.*]], align 4
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; CHECK-NEXT: call void @llvm.experimental.noalias.scope.decl(metadata [[META0:![0-9]+]])
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; CHECK-NEXT: store i32 1, i32* [[P]], align 4, !noalias !0
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; CHECK-NEXT: call void @llvm.assume(i1 true) [ "align"(i32* [[P]], i64 32) ]
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; CHECK-NEXT: store i32 2, i32* [[P]], align 4
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; CHECK-NEXT: [[P21:%.*]] = bitcast i32* [[P]] to i8*
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; CHECK-NEXT: [[P32:%.*]] = call i8* @llvm.launder.invariant.group.p0i8(i8* [[P21]])
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; CHECK-NEXT: [[P43:%.*]] = bitcast i8* [[P32]] to i32*
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; CHECK-NEXT: store i32 3, i32* [[P43]], align 4, !invariant.group !3
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; CHECK-NEXT: ret i32 0
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; CHECK: else2:
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; CHECK-NEXT: store i32 -2, i32* [[P]], align 4
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; CHECK-NEXT: call void @llvm.experimental.noalias.scope.decl(metadata [[META4:![0-9]+]])
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; CHECK-NEXT: store i32 1, i32* [[P]], align 4, !noalias !4
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; CHECK-NEXT: call void @llvm.assume(i1 true) [ "align"(i32* [[P]], i64 32) ]
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; CHECK-NEXT: store i32 2, i32* [[P]], align 4
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; CHECK-NEXT: [[P2:%.*]] = bitcast i32* [[P]] to i8*
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; CHECK-NEXT: [[P3:%.*]] = call i8* @llvm.launder.invariant.group.p0i8(i8* [[P2]])
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; CHECK-NEXT: [[P4:%.*]] = bitcast i8* [[P3]] to i32*
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; CHECK-NEXT: store i32 3, i32* [[P4]], align 4, !invariant.group !3
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; CHECK-NEXT: ret i32 1
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;
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br i1 %c, label %if, label %else
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if:
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store i32 -1, i32* %p
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br label %join
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else:
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store i32 -2, i32* %p
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br label %join
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join:
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call void @llvm.experimental.noalias.scope.decl(metadata !0)
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store i32 1, i32* %p, !noalias !0
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call void @llvm.assume(i1 true) ["align"(i32* %p, i64 32)]
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store i32 2, i32* %p
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%p2 = bitcast i32* %p to i8*
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%p3 = call i8* @llvm.launder.invariant.group.p0i8(i8* %p2)
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%p4 = bitcast i8* %p3 to i32*
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store i32 3, i32* %p4, !invariant.group !{}
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br i1 %c, label %if2, label %else2
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if2:
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ret i32 0
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else2:
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ret i32 1
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}
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declare void @llvm.assume(i1)
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declare void @llvm.experimental.noalias.scope.decl(metadata)
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declare i8* @llvm.launder.invariant.group.p0i8(i8*)
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!0 = !{!1}
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!1 = distinct !{!1, !2, !"scope"}
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!2 = distinct !{!2, !"domain"}
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