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d2bdcd6f8a
If the sprintf function is static (as on mingw-w64, where many stdio functions are static inline wrappers), earlier optimization passes could optimize out the return value altogether, and make it void, which could break optimizations of this libcall that touch the return value. This fixes the issue discussed in PR37408 for the sprintf function. Differential Revision: https://reviews.llvm.org/D46752 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332106 91177308-0d34-0410-b5e6-96231b3b80d8
22 lines
881 B
LLVM
22 lines
881 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine -S | FileCheck %s
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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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@hello_world = constant [13 x i8] c"hello world\0A\00"
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declare void @sprintf(i8*, i8*, ...)
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; Check that a sprintf call, that would otherwise be optimized, but with
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; optimized out return type, doesn't crash the optimizer.
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define void @test_simplify1(i8* %dst) {
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; CHECK-LABEL: @test_simplify1(
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; CHECK-NEXT: call void (i8*, i8*, ...) @sprintf(i8* [[DST:%.*]], i8* getelementptr inbounds ([13 x i8], [13 x i8]* @hello_world, i32 0, i32 0))
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; CHECK-NEXT: ret void
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;
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%fmt = getelementptr [13 x i8], [13 x i8]* @hello_world, i32 0, i32 0
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call void (i8*, i8*, ...) @sprintf(i8* %dst, i8* %fmt)
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ret void
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}
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