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| author | Matt Arsenault <Matthew.Arsenault@amd.com> | 2014-07-14 23:40:43 +0000 |
|---|---|---|
| committer | Matt Arsenault <Matthew.Arsenault@amd.com> | 2014-07-14 23:40:43 +0000 |
| commit | c6ae7b4763f6b12602f116cb15c5d19c628e2c21 (patch) | |
| tree | 490cb1c7f9981311d509fe7e1335aa487957c18a | |
| parent | 37de611c0f4deb72ac85aac4381622cd355bdd26 (diff) | |
| download | bcm5719-llvm-c6ae7b4763f6b12602f116cb15c5d19c628e2c21.tar.gz bcm5719-llvm-c6ae7b4763f6b12602f116cb15c5d19c628e2c21.zip | |
R600/SI: Default to no single precision denormals.
llvm-svn: 213017
| -rw-r--r-- | llvm/lib/Target/R600/AMDGPUAsmPrinter.cpp | 10 | ||||
| -rw-r--r-- | llvm/test/CodeGen/R600/default-fp-mode.ll | 2 |
2 files changed, 10 insertions, 2 deletions
diff --git a/llvm/lib/Target/R600/AMDGPUAsmPrinter.cpp b/llvm/lib/Target/R600/AMDGPUAsmPrinter.cpp index 8c5fc846ed4..b2b7bf9af44 100644 --- a/llvm/lib/Target/R600/AMDGPUAsmPrinter.cpp +++ b/llvm/lib/Target/R600/AMDGPUAsmPrinter.cpp @@ -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); } diff --git a/llvm/test/CodeGen/R600/default-fp-mode.ll b/llvm/test/CodeGen/R600/default-fp-mode.ll index 214b2c20369..4488bdb7f44 100644 --- a/llvm/test/CodeGen/R600/default-fp-mode.ll +++ b/llvm/test/CodeGen/R600/default-fp-mode.ll @@ -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 |
