40 lines
1.4 KiB
LLVM
40 lines
1.4 KiB
LLVM
; RUN: not llc -o /dev/null %s -mtriple=i386-unknown-unknown 2>&1 | FileCheck %s
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; This test was derived from this C code. The frontend sees that the constraint
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; doesn't accept memory, but the argument is a strict. So it tries to bitcast
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; to an integer of the same size. SelectionDAGBuilder doesn't know how to copy
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; between integers and fp80 so it asserts or crashes.
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;
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; gcc accepts the code. But rejects it if the struct is replaced by an int. From
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; the InlineAsm block those two cases look the same in LLVM IR. So if the single
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; elementstruct case is valid, then the frontend needs to emit different IR.
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; typedef struct float4 {
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; float f;
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; } float4;
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;
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; int main() {
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; float4 f4;
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; f4.f = 4.0f;
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; __asm ("fadd %%st(0), %%st(0)" : "+t" (f4));
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; return 0;
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; }
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%struct.float4 = type { float }
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; CHECK: error: couldn't allocate output register for constraint '{st}'
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define dso_local i32 @foo() {
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entry:
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%retval = alloca i32, align 4
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%f4 = alloca %struct.float4, align 4
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store i32 0, i32* %retval, align 4
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%f = getelementptr inbounds %struct.float4, %struct.float4* %f4, i32 0, i32 0
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store float 4.000000e+00, float* %f, align 4
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%0 = bitcast %struct.float4* %f4 to i32*
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%1 = load i32, i32* %0, align 4
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%2 = call i32 asm "fadd %st(0), %st(0)", "={st},0,~{dirflag},~{fpsr},~{flags}"(i32 %1)
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%3 = bitcast %struct.float4* %f4 to i32*
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store i32 %2, i32* %3, align 4
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ret i32 0
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}
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