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R600/SI: Default to no single precision denormals.

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llvm-svn: 213017
This commit is contained in:
Matt Arsenault 2014-07-14 23:40:43 +00:00
parent b548922185
commit 62262e12fa
2 changed files with 10 additions and 2 deletions
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10
lib/Target/R600/AMDGPUAsmPrinter.cpp
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@ -47,10 +47,18 @@ using namespace llvm;
// precision, and leaves single precision to flush all and does not report
// CL_FP_DENORM for CL_DEVICE_SINGLE_FP_CONFIG. Mesa's OpenCL currently reports
// CL_FP_DENORM for both.
//
// FIXME: It seems some instructions do not support single precision denormals
// regardless of the mode (exp_*_f32, rcp_*_f32, rsq_*_f32, rsq_*f32, sqrt_f32,
// and sin_f32, cos_f32 on most parts).
// We want to use these instructions, and using fp32 denormals also causes
// instructions to run at the double precision rate for the device so it's
// probably best to just report no single precision denormals.
static uint32_t getFPMode(const MachineFunction &) {
return FP_ROUND_MODE_SP(FP_ROUND_ROUND_TO_NEAREST) |
FP_ROUND_MODE_DP(FP_ROUND_ROUND_TO_NEAREST) |
FP_DENORM_MODE_SP(FP_DENORM_FLUSH_NONE) |
FP_DENORM_MODE_SP(FP_DENORM_FLUSH_IN_FLUSH_OUT) |
FP_DENORM_MODE_DP(FP_DENORM_FLUSH_NONE);
}

2
test/CodeGen/R600/default-fp-mode.ll
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@ -1,7 +1,7 @@
; RUN: llc -march=r600 -mcpu=SI < %s | FileCheck -check-prefix=SI %s
; SI-LABEL: @test_kernel
; SI: FloatMode: 240
; SI: FloatMode: 192
; SI: IeeeMode: 0
define void @test_kernel(float addrspace(1)* %out0, double addrspace(1)* %out1) nounwind {
store float 0.0, float addrspace(1)* %out0