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In LLVM FMA3 operands are dst, src1, src2, src3, however dst is not encoded as it is always src1. This was causing the encoding of the operands to be off by one.

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Patch by Chris Bieneman.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188866 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2013-08-21 05:03:10 +00:00
parent 9397683e62
commit ec7b5e9290
2 changed files with 26 additions and 2 deletions
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8
lib/Target/X86/X86CodeEmitter.cpp
View File

@ -985,8 +985,14 @@ void Emitter<CodeEmitter>::emitVEXOpcodePrefix(uint64_t TSFlags,
if (X86II::isX86_64ExtendedReg(MI.getOperand(0).getReg()))
VEX_R = 0x0;
if (HasVEX_4V)
if (HasVEX_4V) {
if (HasMemOp4)
VEX_4V = getVEXRegisterEncoding(MI, 1);
else
// FMA3 instructions operands are dst, src1, src2, src3
// dst and src1 are the same and not encoded separately
VEX_4V = getVEXRegisterEncoding(MI, 2);
}
if (X86II::isX86_64ExtendedReg(
MI.getOperand(MemOperand+X86::AddrBaseReg).getReg()))

18
test/ExecutionEngine/fma3-jit.ll Normal file
View File

@ -0,0 +1,18 @@
; RUN: %lli %s | FileCheck %s
; REQUIRES: fma3
; CHECK: 12.000000
@msg_double = internal global [4 x i8] c"%f\0A\00"
declare i32 @printf(i8*, ...)
define i32 @main() {
%fma = tail call double @llvm.fma.f64(double 3.0, double 3.0, double 3.0) nounwind readnone
%ptr1 = getelementptr [4 x i8]* @msg_double, i32 0, i32 0
call i32 (i8*,...)* @printf(i8* %ptr1, double %fma)
ret i32 0
}
declare double @llvm.fma.f64(double, double, double) nounwind readnone