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0a500af186
According to the x86-64 ABI, structures with both floating point and integer members are split between floating-point and general purpose registers, and consecutive 32-bit floats can be packed into a single floating point register. In the case of variadic functions these are stored to memory and the position recorded in the va_list. This was already correctly implemented in llvm.va_start. The problem is that the code in clang for implementing va_arg was reading floating point registers from the wrong location. Patch by Thomas Jablin. Fixes PR20018. llvm-svn: 211626
16 lines
470 B
C
16 lines
470 B
C
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -emit-llvm %s -o - | FileCheck %s
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struct Bar {
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float f1;
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float f2;
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unsigned u;
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};
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struct Bar foo(__builtin_va_list ap) {
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return __builtin_va_arg(ap, struct Bar);
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// CHECK: [[FPOP:%.*]] = getelementptr inbounds %struct.__va_list_tag* {{.*}}, i32 0, i32 1
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// CHECK: [[FPO:%.*]] = load i32* [[FPOP]]
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// CHECK: [[FPVEC:%.*]] = getelementptr i8* {{.*}}, i32 [[FPO]]
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// CHECK: bitcast i8* [[FPVEC]] to <2 x float>*
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}
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