[clang] cab9c02 - [Clang] Fix behavior of -ffp-model option when overriden
Qiu Chaofan via cfe-commits
cfe-commits at lists.llvm.org
Thu Nov 17 18:34:53 PST 2022
Author: Qiu Chaofan
Date: 2022-11-18T10:34:41+08:00
New Revision: cab9c02bd97f520cb8a01a9197505438581f7de8
URL: https://github.com/llvm/llvm-project/commit/cab9c02bd97f520cb8a01a9197505438581f7de8
DIFF: https://github.com/llvm/llvm-project/commit/cab9c02bd97f520cb8a01a9197505438581f7de8.diff
LOG: [Clang] Fix behavior of -ffp-model option when overriden
-ffp-model=strict -ffp-model=fast will still enable strict exception
handling behavior, therefore clang still emits constrained FP operations
in IR.
-ffp-model=fast -ffp-model=strict emits two warnings: one for strict
overriding fast, the other for strict overriding strict, which is
confusing.
Reviewed By: zahiraam
Differential Revision: https://reviews.llvm.org/D137618
Added:
Modified:
clang/lib/Driver/ToolChains/Clang.cpp
clang/test/CodeGen/ffp-model.c
clang/test/Driver/fp-model.c
Removed:
################################################################################
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 46f642bbbb508..deb4464681e69 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -3041,6 +3041,7 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
SignedZeros = false;
TrappingMath = false;
RoundingFPMath = false;
+ FPExceptionBehavior = "";
// If fast-math is set then set the fp-contract mode to fast.
FPContract = "fast";
SeenUnsafeMathModeOption = true;
@@ -3081,10 +3082,12 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
else {
StrictFPModel = false;
FPModel = "";
- D.Diag(clang::diag::warn_drv_overriding_flag_option)
- << "-ffp-model=strict" <<
- ((A->getNumValues() == 0) ? A->getSpelling()
- : Args.MakeArgString(A->getSpelling() + A->getValue()));
+ auto RHS = (A->getNumValues() == 0)
+ ? A->getSpelling()
+ : Args.MakeArgString(A->getSpelling() + A->getValue());
+ if (RHS != "-ffp-model=strict")
+ D.Diag(clang::diag::warn_drv_overriding_flag_option)
+ << "-ffp-model=strict" << RHS;
}
}
diff --git a/clang/test/CodeGen/ffp-model.c b/clang/test/CodeGen/ffp-model.c
index e7f911fd571f2..57fa0ef278205 100644
--- a/clang/test/CodeGen/ffp-model.c
+++ b/clang/test/CodeGen/ffp-model.c
@@ -36,9 +36,9 @@ float mymuladd(float x, float y, float z) {
// CHECK-STRICT-FAST: load float, ptr
// CHECK-STRICT-FAST: load float, ptr
- // CHECK-STRICT-FAST: call fast float @llvm.experimental.constrained.fmul.f32(float {{.*}}, float {{.*}}, {{.*}})
+ // CHECK-STRICT-FAST: fmul fast float {{.*}}, {{.*}}
// CHECK-STRICT-FAST: load float, ptr
- // CHECK-STRICT-FAST: call fast float @llvm.experimental.constrained.fadd.f32(float {{.*}}, float {{.*}}, {{.*}}
+ // CHECK-STRICT-FAST: fadd fast float {{.*}}, {{.*}}
// CHECK-FAST1: load float, ptr
// CHECK-FAST1: load float, ptr
diff --git a/clang/test/Driver/fp-model.c b/clang/test/Driver/fp-model.c
index 77419551d27c2..4253cf7a50f20 100644
--- a/clang/test/Driver/fp-model.c
+++ b/clang/test/Driver/fp-model.c
@@ -66,6 +66,17 @@
// RUN: | FileCheck --check-prefix=WARN10 %s
// WARN10: warning: overriding '-ffp-model=strict' option with '-fdenormal-fp-math=preserve-sign,preserve-sign' [-Woverriding-t-option]
+// RUN: %clang -### -ffp-model=fast -ffp-model=strict -c %s 2>&1 | FileCheck \
+// RUN: --check-prefix=WARN11 %s
+// WARN11: warning: overriding '-ffp-model=fast' option with '-ffp-model=strict' [-Woverriding-t-option]
+// WARN11-NOT: warning: overriding '-ffp-model=strict' option with '-ffp-model=strict' [-Woverriding-t-option]
+
+// RUN: %clang -### -Ofast -ffp-model=strict -c %s 2>&1 | FileCheck \
+// RUN: --check-prefix=WARN12 %s
+// RUN: %clang -### -ffast-math -ffp-model=strict -c %s 2>&1 | FileCheck \
+// RUN: --check-prefix=WARN12 %s
+// WARN12-NOT: warning: overriding '-ffp-model=strict' option with '-ffp-model=strict' [-Woverriding-t-option]
+
// RUN: %clang -### -c %s 2>&1 \
// RUN: | FileCheck --check-prefix=CHECK-NOROUND %s
// CHECK-NOROUND: "-cc1"
@@ -107,6 +118,13 @@
// CHECK-FPM-STRICT: "-frounding-math"
// CHECK-FPM-STRICT: "-ffp-exception-behavior=strict"
+// RUN: %clang -### -nostdinc -ffp-model=strict -ffp-model=fast -c %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-NO-EXCEPT %s
+// RUN: %clang -### -nostdinc -ffp-model=strict -ffast-math -c %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-NO-EXCEPT %s
+// RUN: %clang -### -nostdinc -ffp-model=strict -Ofast -c %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-NO-EXCEPT %s
+// CHECK-NO-EXCEPT-NOT: "-ffp-exception-behavior=strict"
// RUN: %clang -### -nostdinc -ffp-exception-behavior=strict -c %s 2>&1 \
// RUN: | FileCheck --check-prefix=CHECK-FEB-STRICT %s
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