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| author | Ahmed Bougacha <ahmed.bougacha@gmail.com> | 2016-02-02 01:44:03 +0000 |
|---|---|---|
| committer | Ahmed Bougacha <ahmed.bougacha@gmail.com> | 2016-02-02 01:44:03 +0000 |
| commit | 68a8efa374740a0829e77f57c8a2b13bead85d7f (patch) | |
| tree | 2d5869701a9f2cea00f6ab9622f99439de403bfd | |
| parent | 55c6682ae22910fb73b0e03e25cba68c0f99faa9 (diff) | |
| download | bcm5719-llvm-68a8efa374740a0829e77f57c8a2b13bead85d7f.tar.gz bcm5719-llvm-68a8efa374740a0829e77f57c8a2b13bead85d7f.zip | |
[X86][FastISel] Don't force Nearest-Even rounding for VCVTPS2PH, use MXCSR.
FastISel counterpart to r259448.
llvm-svn: 259449
| -rw-r--r-- | llvm/lib/Target/X86/X86FastISel.cpp | 6 | ||||
| -rw-r--r-- | llvm/test/CodeGen/X86/fast-isel-float-half-convertion.ll | 2 |
2 files changed, 5 insertions, 3 deletions
diff --git a/llvm/lib/Target/X86/X86FastISel.cpp b/llvm/lib/Target/X86/X86FastISel.cpp index f48b47934e0..854a4e7932e 100644 --- a/llvm/lib/Target/X86/X86FastISel.cpp +++ b/llvm/lib/Target/X86/X86FastISel.cpp @@ -2294,8 +2294,10 @@ bool X86FastISel::fastLowerIntrinsicCall(const IntrinsicInst *II) { // register class VR128 by method 'constrainOperandRegClass' which is // directly called by 'fastEmitInst_ri'. // Instruction VCVTPS2PHrr takes an extra immediate operand which is - // used to provide rounding control. - InputReg = fastEmitInst_ri(X86::VCVTPS2PHrr, RC, InputReg, false, 0); + // used to provide rounding control: use MXCSR.RC, encoded as 0b100. + // It's consistent with the other FP instructions, which are usually + // controlled by MXCSR. + InputReg = fastEmitInst_ri(X86::VCVTPS2PHrr, RC, InputReg, false, 4); // Move the lower 32-bits of ResultReg to another register of class GR32. ResultReg = createResultReg(&X86::GR32RegClass); diff --git a/llvm/test/CodeGen/X86/fast-isel-float-half-convertion.ll b/llvm/test/CodeGen/X86/fast-isel-float-half-convertion.ll index 707a325bf41..acb85fd171f 100644 --- a/llvm/test/CodeGen/X86/fast-isel-float-half-convertion.ll +++ b/llvm/test/CodeGen/X86/fast-isel-float-half-convertion.ll @@ -4,7 +4,7 @@ define i16 @test_fp32_to_fp16(float %a) { ; CHECK-LABEL: test_fp32_to_fp16: -; CHECK: vcvtps2ph $0, %xmm0, %xmm0 +; CHECK: vcvtps2ph $4, %xmm0, %xmm0 ; CHECK-NEXT: vmovd %xmm0, %eax ; CHECK-NEXT: retq entry: |
