tra updated this revision to Diff 57541.
tra added a comment.
Added test case.
Is there a better way to test that correct options are passed to back-end?
This test resorts to checking assembly generated by back-end which is way too
far away from what actually needs testing.
http://reviews.llvm.org/D20341
Files:
lib/Frontend/CompilerInvocation.cpp
test/CodeGenCUDA/fp-contract.cu
Index: test/CodeGenCUDA/fp-contract.cu
===================================================================
--- /dev/null
+++ test/CodeGenCUDA/fp-contract.cu
@@ -0,0 +1,32 @@
+// REQUIRES: x86-registered-target
+// REQUIRES: nvptx-registered-target
+
+// By default we should fuse multiply/add into fma instruction.
+// RUN: %clang_cc1 -fcuda-is-device -triple nvptx-nvidia-cuda -S \
+// RUN: -disable-llvm-passes -o - %s | FileCheck -check-prefix ENABLED %s
+
+// Explicit -ffp-contract=fast
+// RUN: %clang_cc1 -fcuda-is-device -triple nvptx-nvidia-cuda -S \
+// RUN: -ffp-contract=fast -disable-llvm-passes -o - %s \
+// RUN: | FileCheck -check-prefix ENABLED %s
+
+// Explicit -ffp-contract=on -- fusing by front-end (disabled).
+// RUN: %clang_cc1 -fcuda-is-device -triple nvptx-nvidia-cuda -S \
+// RUN: -ffp-contract=on -disable-llvm-passes -o - %s \
+// RUN: | FileCheck -check-prefix DISABLED %s
+
+// Explicit -ffp-contract=off should disable instruction fusing.
+// RUN: %clang_cc1 -fcuda-is-device -triple nvptx-nvidia-cuda -S \
+// RUN: -ffp-contract=off -disable-llvm-passes -o - %s \
+// RUN: | FileCheck -check-prefix DISABLED %s
+
+
+#include "Inputs/cuda.h"
+
+__host__ __device__ float func(float a, float b, float c) { return a + b * c; }
+// ENABLED: fma.rn.f32
+// ENABLED-NEXT: st.param.f32
+
+// DISABLED: mul.rn.f32
+// DISABLED-NEXT: add.rn.f32
+// DISABLED-NEXT: st.param.f32
Index: lib/Frontend/CompilerInvocation.cpp
===================================================================
--- lib/Frontend/CompilerInvocation.cpp
+++ lib/Frontend/CompilerInvocation.cpp
@@ -2212,10 +2212,15 @@
LangOpts.ObjCExceptions = 1;
}
- // During CUDA device-side compilation, the aux triple is the triple used for
- // host compilation.
- if (LangOpts.CUDA && LangOpts.CUDAIsDevice) {
- Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
+ if (LangOpts.CUDA) {
+ // During CUDA device-side compilation, the aux triple is the
+ // triple used for host compilation.
+ if (LangOpts.CUDAIsDevice)
+ Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
+
+ // Set default FP_CONTRACT to FAST.
+ if (!Args.hasArg(OPT_ffp_contract))
+ Res.getCodeGenOpts().setFPContractMode(CodeGenOptions::FPC_Fast);
}
// FIXME: Override value name discarding when asan or msan is used because
the
Index: test/CodeGenCUDA/fp-contract.cu
===================================================================
--- /dev/null
+++ test/CodeGenCUDA/fp-contract.cu
@@ -0,0 +1,32 @@
+// REQUIRES: x86-registered-target
+// REQUIRES: nvptx-registered-target
+
+// By default we should fuse multiply/add into fma instruction.
+// RUN: %clang_cc1 -fcuda-is-device -triple nvptx-nvidia-cuda -S \
+// RUN: -disable-llvm-passes -o - %s | FileCheck -check-prefix ENABLED %s
+
+// Explicit -ffp-contract=fast
+// RUN: %clang_cc1 -fcuda-is-device -triple nvptx-nvidia-cuda -S \
+// RUN: -ffp-contract=fast -disable-llvm-passes -o - %s \
+// RUN: | FileCheck -check-prefix ENABLED %s
+
+// Explicit -ffp-contract=on -- fusing by front-end (disabled).
+// RUN: %clang_cc1 -fcuda-is-device -triple nvptx-nvidia-cuda -S \
+// RUN: -ffp-contract=on -disable-llvm-passes -o - %s \
+// RUN: | FileCheck -check-prefix DISABLED %s
+
+// Explicit -ffp-contract=off should disable instruction fusing.
+// RUN: %clang_cc1 -fcuda-is-device -triple nvptx-nvidia-cuda -S \
+// RUN: -ffp-contract=off -disable-llvm-passes -o - %s \
+// RUN: | FileCheck -check-prefix DISABLED %s
+
+
+#include "Inputs/cuda.h"
+
+__host__ __device__ float func(float a, float b, float c) { return a + b * c; }
+// ENABLED: fma.rn.f32
+// ENABLED-NEXT: st.param.f32
+
+// DISABLED: mul.rn.f32
+// DISABLED-NEXT: add.rn.f32
+// DISABLED-NEXT: st.param.f32
Index: lib/Frontend/CompilerInvocation.cpp
===================================================================
--- lib/Frontend/CompilerInvocation.cpp
+++ lib/Frontend/CompilerInvocation.cpp
@@ -2212,10 +2212,15 @@
LangOpts.ObjCExceptions = 1;
}
- // During CUDA device-side compilation, the aux triple is the triple used for
- // host compilation.
- if (LangOpts.CUDA && LangOpts.CUDAIsDevice) {
- Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
+ if (LangOpts.CUDA) {
+ // During CUDA device-side compilation, the aux triple is the
+ // triple used for host compilation.
+ if (LangOpts.CUDAIsDevice)
+ Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
+
+ // Set default FP_CONTRACT to FAST.
+ if (!Args.hasArg(OPT_ffp_contract))
+ Res.getCodeGenOpts().setFPContractMode(CodeGenOptions::FPC_Fast);
}
// FIXME: Override value name discarding when asan or msan is used because the
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