757a0e6d3b
This patch fixes an error in which `FAKE_USE` instructions would trigger an assertion in SystemZLongBranch due to them having a size of 0 without being excepted in the assertion that each instruction, other than a set of known 0-size instruction types, should have a non-0 size. `FAKE_USE` instructions are no-op instructions that are emitted into LLVM by the `-fextend-variable-liveness` clang flag to help preserve the liveness of source variables in optimized code, and therefore they should be understood as being valid size 0 instructions.
15 lines
370 B
LLVM
15 lines
370 B
LLVM
; RUN: llc -O0 < %s -mtriple=s390x-linux-gnu 2>&1 | FileCheck %s
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;; Tests that we can handle FAKE_USE instructions, emitting a comment for them
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;; in the resulting assembly.
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; CHECK: .type idd,@function
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; CHECK: # %bb.0:
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; CHECK-NEXT: # fake_use:
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define double @idd(double %d) {
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entry:
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notail call void (...) @llvm.fake.use(double %d)
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ret double %d
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}
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