fb5683449e
This is a partial revert of D128830, restoring the previous position of DeadArgElim in the fat LTO pipeline. The motivation for this is a major code size regression observed in Rust and illustrated in the PhaseOrdering test. This is a conservative fix restoring the previous pipeline order. The real problem is that the LTO pipeline is conceptually broken: It doesn't have a CGSCC function simplification pipeline. The inliner is just being run by itself. This wouldn't be a problem if fat LTO used a standard design where ArgPromotion and DAE are only run after functions have already been simplified by the CGSCC inliner pipeline. Differential Revision: https://reviews.llvm.org/D146051
53 lines
1.3 KiB
LLVM
53 lines
1.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -passes='default<O3>' < %s | FileCheck %s --check-prefixes=CHECK,DEFAULT
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; RUN: opt -S -passes='lto<O3>' < %s | FileCheck %s --check-prefixes=CHECK,LTO
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declare void @llvm.trap()
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define void @do_trap(ptr %ptr) {
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; CHECK-LABEL: @do_trap(
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; CHECK-NEXT: tail call void @llvm.trap()
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; CHECK-NEXT: unreachable
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;
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call void @llvm.trap()
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unreachable
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}
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define internal void @capture_and_trap(ptr %ptr) noinline {
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; CHECK-LABEL: @capture_and_trap(
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; CHECK-NEXT: tail call void @llvm.trap()
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; CHECK-NEXT: unreachable
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;
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%alloca = alloca ptr, align 4
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store ptr %ptr, ptr %alloca, align 4
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call void @do_trap(ptr noundef nonnull %alloca)
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unreachable
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}
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define internal void @dead_fn1() {
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ret void
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}
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define internal void @dead_fn2() {
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ret void
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}
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define void @test(i1 %c) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: tail call fastcc void @capture_and_trap()
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; CHECK-NEXT: unreachable
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;
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br i1 %c, label %if, label %else
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if:
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call void @capture_and_trap(ptr @dead_fn1)
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unreachable
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else:
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call void @capture_and_trap(ptr @dead_fn2)
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unreachable
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}
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;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
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; DEFAULT: {{.*}}
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; LTO: {{.*}}
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