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70 lines
2.0 KiB
LLVM
Executable File
70 lines
2.0 KiB
LLVM
Executable File
; Given a library call that is represented as an llvm intrinsic call, but
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; later transformed to an actual call, if an overriding definition of that
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; library routine is provided indirectly via an alias, verify that LTO
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; does not eliminate the definition. This is a test for PR38547.
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;
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; RUN: llvm-as -o %t1 %s
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; RUN: llvm-lto -exported-symbol=main -save-merged-module -filetype=asm -o %t2 %t1
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; RUN: llvm-dis -o - %t2.merged.bc | FileCheck --check-prefix=CHECK_IR %s
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;
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; Check that the call is represented as an llvm intrinsic in the IR after LTO:
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; CHECK_IR-LABEL: main
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; CHECK_IR: call float @llvm.log.f32
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;
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; Check that the IR contains the overriding definition of the library routine
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; in the IR after LTO:
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; CHECK_IR: define internal float @logf(float
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; CHECK_IR-NEXT: [[TMP:%.*]] = fadd float
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; CHECK_IR-NEXT: ret float [[TMP]]
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;
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; Check that the assembly code from LTO contains the call to the expected
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; library routine, and that the overriding definition of the library routine
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; is present:
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; RUN: FileCheck --check-prefix=CHECK_ASM %s < %t2
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; CHECK_ASM-LABEL: main:
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; CHECK_ASM: callq logf
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; CHECK_ASM-LABEL: logf:
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; CHECK_ASM-NEXT: add
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; CHECK_ASM-NEXT: ret
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; Produced from the following source-code:
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;
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;extern float logf(float);
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;// 'src' and 'dst' are 'volatile' to prohibit optimization.
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;volatile float src = 3.14f;
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;volatile float dst;
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;
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;int main() {
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; dst = logf(src);
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; return 0;
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;}
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;
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;extern float fname(float x);
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;float fname(float x) {
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; return x + x;
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;}
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;
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;float logf(float x) __attribute__((alias("fname")));
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;
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target triple = "x86_64-unknown-linux-gnu"
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@src = global float 0x40091EB860000000, align 4
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@dst = common global float 0.000000e+00, align 4
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@logf = alias float (float), float (float)* @fname
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define i32 @main() local_unnamed_addr {
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entry:
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%0 = load volatile float, float* @src, align 4
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%1 = tail call float @llvm.log.f32(float %0)
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store volatile float %1, float* @dst, align 4
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ret i32 0
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}
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declare float @llvm.log.f32(float)
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define float @fname(float %x) {
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%add = fadd float %x, %x
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ret float %add
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}
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