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64bac7eb58
GCC documentation for the `wa` constraint states that:
```
wa
A VSX register (VSR), vs0…vs63. This is either an FPR (vs0…vs31 are f0…f31)
or a VR (vs32…vs63 are v0…v31).
```
This technically means that we could accept floating point parameters. In fact,
gcc itself does. The following testcase compiles and runs on all PPC platforms with GCC,
whereas clang/llc will assert:
```
#include <stdio.h>
double foo ( vector double a ) {
double b, c;
asm("xvabsdp %x0, %x2 \n"
"xxsldwi %x1, %x0, %x0, 2 \n"
: "+wa" (b),
"=wa" (c)
: "wa" (a)
);
return b+c;
}
int main(void) {
vector double a = {-3., -4.};
double t = foo( a );
printf("%g\n", t);
}
```
This patch allows clang/llc to build and run this testcase.
Reviewed By: nemanjai, #powerpc
Differential Revision: https://reviews.llvm.org/D103409
23 lines
865 B
LLVM
23 lines
865 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple powerpc64le-linux-gnu --ppc-asm-full-reg-names \
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; RUN: -verify-machineinstrs -mattr=vsx -mattr=altivec < %s | \
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; RUN: FileCheck %s
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define double @foo(<2 x double> %a) {
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; CHECK-LABEL: foo:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: #APP
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; CHECK-NEXT: xvabsdp vs0, vs34
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; CHECK-NEXT: xxsldwi vs1, vs0, vs0, 2
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; CHECK-EMPTY:
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; CHECK-NEXT: #NO_APP
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; CHECK-NEXT: xsadddp f1, f0, f1
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; CHECK-NEXT: blr
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entry:
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%0 = call { double, double } asm "xvabsdp ${0:x}, ${2:x} \0Axxsldwi ${1:x}, ${0:x}, ${0:x}, 2 \0A", "=^wa,=^wa,^wa,0"(<2 x double> %a, double undef)
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%asmresult = extractvalue { double, double } %0, 0
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%asmresult1 = extractvalue { double, double } %0, 1
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%add = fadd double %asmresult, %asmresult1
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ret double %add
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}
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