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Revert "Reland D74436 "Change clang option -ffp-model=precise to select ffp-contract=on"""
Reverting because this patch is causing ~20 llvm-test-suite failures on
a number of different bots:
* http://lab.llvm.org:8011/builders/clang-cmake-armv8-lld/builds/3366
* http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/8222
* http://lab.llvm.org:8011/builders/clang-cmake-x86_64-avx2-linux/builds/13275
* http://lab.llvm.org:8011/builders/clang-s390x-linux-lnt/builds/17213
This reverts commit cd2c5af6df.
This commit is contained in:
Oliver Stannard
@@ -1190,50 +1190,8 @@ installed.
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Controlling Floating Point Behavior
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-----------------------------------
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Clang provides a number of ways to control floating point behavior, including
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with command line options and source pragmas. This section
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describes the various floating point semantic modes and the corresponding options.
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.. csv-table:: Floating Point Semantic Modes
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:header: "Mode", "Values"
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:widths: 15, 30, 30
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"except_behavior", "{ignore, strict, may_trap}", "ffp-exception-behavior"
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"fenv_access", "{off, on}", "(none)"
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"rounding_mode", "{dynamic, tonearest, downward, upward, towardzero}", "frounding-math"
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"contract", "{on, off, fast}", "ffp-contract"
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"denormal_fp_math", "{IEEE, PreserveSign, PositiveZero}", "fdenormal-fp-math"
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"denormal_fp32_math", "{IEEE, PreserveSign, PositiveZero}", "fdenormal-fp-math-fp32"
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"support_math_errno", "{on, off}", "fmath-errno"
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"no_honor_nans", "{on, off}", "fhonor-nans"
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"no_honor_infinities", "{on, off}", "fhonor-infinities"
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"no_signed_zeros", "{on, off}", "fsigned-zeros"
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"allow_reciprocal", "{on, off}", "freciprocal-math"
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"allow_approximate_fns", "{on, off}", "(none)"
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"allow_reassociation", "{on, off}", "fassociative-math"
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This table describes the option settings that correspond to the three
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floating point semantic models: precise (the default), strict, and fast.
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.. csv-table:: Floating Point Models
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:header: "Mode", "Precise", "Strict", "Fast"
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:widths: 25, 15, 15, 15
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"except_behavior", "ignore", "strict", "ignore"
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"fenv_access", "off", "on", "off"
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"rounding_mode", "tonearest", "dynamic", "tonearest"
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"contract", "on", "off", "fast"
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"denormal_fp_math", "IEEE", "IEEE", "PreserveSign"
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"denormal_fp32_math", "IEEE","IEEE", "PreserveSign"
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"support_math_errno", "on", "on", "off"
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"no_honor_nans", "off", "off", "on"
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"no_honor_infinities", "off", "off", "on"
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"no_signed_zeros", "off", "off", "on"
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"allow_reciprocal", "off", "off", "on"
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"allow_approximate_fns", "off", "off", "on"
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"allow_reassociation", "off", "off", "on"
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Clang provides a number of ways to control floating point behavior. The options
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are listed below.
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.. option:: -ffast-math
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@@ -1427,7 +1385,7 @@ Note that floating-point operations performed as part of constant initialization
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and ``fast``.
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Details:
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* ``precise`` Disables optimizations that are not value-safe on floating-point data, although FP contraction (FMA) is enabled (``-ffp-contract=on``). This is the default behavior.
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* ``precise`` Disables optimizations that are not value-safe on floating-point data, although FP contraction (FMA) is enabled (``-ffp-contract=fast``). This is the default behavior.
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* ``strict`` Enables ``-frounding-math`` and ``-ffp-exception-behavior=strict``, and disables contractions (FMA). All of the ``-ffast-math`` enablements are disabled.
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* ``fast`` Behaves identically to specifying both ``-ffast-math`` and ``ffp-contract=fast``
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@@ -2525,9 +2525,10 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
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llvm::DenormalMode DenormalFPMath = DefaultDenormalFPMath;
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llvm::DenormalMode DenormalFP32Math = DefaultDenormalFP32Math;
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StringRef FPContract = "on";
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StringRef FPContract = "";
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bool StrictFPModel = false;
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if (const Arg *A = Args.getLastArg(options::OPT_flimited_precision_EQ)) {
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CmdArgs.push_back("-mlimit-float-precision");
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CmdArgs.push_back(A->getValue());
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@@ -2550,6 +2551,7 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
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SignedZeros = true;
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// -fno_fast_math restores default denormal and fpcontract handling
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DenormalFPMath = DefaultDenormalFPMath;
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FPContract = "";
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StringRef Val = A->getValue();
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if (OFastEnabled && !Val.equals("fast")) {
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// Only -ffp-model=fast is compatible with OFast, ignore.
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@@ -2563,10 +2565,12 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
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// ffp-model= is a Driver option, it is entirely rewritten into more
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// granular options before being passed into cc1.
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// Use the gcc option in the switch below.
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if (!FPModel.empty() && !FPModel.equals(Val))
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if (!FPModel.empty() && !FPModel.equals(Val)) {
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D.Diag(clang::diag::warn_drv_overriding_flag_option)
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<< Args.MakeArgString("-ffp-model=" + FPModel)
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<< Args.MakeArgString("-ffp-model=" + Val);
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FPContract = "";
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}
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if (Val.equals("fast")) {
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optID = options::OPT_ffast_math;
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FPModel = Val;
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@@ -2574,7 +2578,7 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
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} else if (Val.equals("precise")) {
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optID = options::OPT_ffp_contract;
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FPModel = Val;
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FPContract = "on";
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FPContract = "fast";
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PreciseFPModel = true;
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} else if (Val.equals("strict")) {
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StrictFPModel = true;
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@@ -2660,11 +2664,9 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
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case options::OPT_ffp_contract: {
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StringRef Val = A->getValue();
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if (PreciseFPModel) {
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// When -ffp-model=precise is seen on the command line,
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// the boolean PreciseFPModel is set to true which indicates
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// "the current option is actually PreciseFPModel". The optID
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// is changed to OPT_ffp_contract and FPContract is set to "on".
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// the argument Val string is "precise": it shouldn't be checked.
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// -ffp-model=precise enables ffp-contract=fast as a side effect
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// the FPContract value has already been set to a string literal
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// and the Val string isn't a pertinent value.
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;
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} else if (Val.equals("fast") || Val.equals("on") || Val.equals("off"))
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FPContract = Val;
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@@ -2761,7 +2763,7 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
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// -fno_fast_math restores default denormal and fpcontract handling
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DenormalFPMath = DefaultDenormalFPMath;
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DenormalFP32Math = DefaultDenormalFP32Math;
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FPContract = "on";
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FPContract = "";
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break;
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}
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if (StrictFPModel) {
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@@ -2771,7 +2773,7 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
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if (HonorINFs && HonorNaNs &&
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!AssociativeMath && !ReciprocalMath &&
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SignedZeros && TrappingMath && RoundingFPMath &&
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FPContract.equals("off"))
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(FPContract.equals("off") || FPContract.empty()))
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// OK: Current Arg doesn't conflict with -ffp-model=strict
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;
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else {
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@@ -2,9 +2,9 @@
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// REQUIRES: powerpc-registered-target
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// RUN: %clang -S -emit-llvm -target powerpc64-unknown-linux-gnu -mcpu=pwr8 -ffreestanding -DNO_WARN_X86_INTRINSICS %s \
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// RUN: -ffp-contract=off -fno-discard-value-names -mllvm -disable-llvm-optzns -o - | llvm-cxxfilt -n | FileCheck %s --check-prefixes=CHECK,CHECK-BE
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// RUN: -fno-discard-value-names -mllvm -disable-llvm-optzns -o - | llvm-cxxfilt -n | FileCheck %s --check-prefixes=CHECK,CHECK-BE
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// RUN: %clang -S -emit-llvm -target powerpc64le-unknown-linux-gnu -mcpu=pwr8 -ffreestanding -DNO_WARN_X86_INTRINSICS %s \
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// RUN: -ffp-contract=off -fno-discard-value-names -mllvm -disable-llvm-optzns -o - | llvm-cxxfilt -n | FileCheck %s --check-prefixes=CHECK,CHECK-LE
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// RUN: -fno-discard-value-names -mllvm -disable-llvm-optzns -o - | llvm-cxxfilt -n | FileCheck %s --check-prefixes=CHECK,CHECK-LE
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// CHECK-BE-DAG: @_mm_movemask_pd.perm_mask = internal constant <4 x i32> <i32 -2139062144, i32 -2139062144, i32 -2139062144, i32 -2139078656>, align 16
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// CHECK-BE-DAG: @_mm_shuffle_epi32.permute_selectors = internal constant [4 x i32] [i32 66051, i32 67438087, i32 134810123, i32 202182159], align 4
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@@ -2,9 +2,9 @@
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// REQUIRES: powerpc-registered-target
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// RUN: %clang -S -emit-llvm -target powerpc64-unknown-linux-gnu -mcpu=pwr8 -ffreestanding -DNO_WARN_X86_INTRINSICS %s \
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// RUN: -ffp-contract=off -fno-discard-value-names -mllvm -disable-llvm-optzns -o - | llvm-cxxfilt -n | FileCheck %s --check-prefixes=CHECK,CHECK-BE
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// RUN: -fno-discard-value-names -mllvm -disable-llvm-optzns -o - | llvm-cxxfilt -n | FileCheck %s --check-prefixes=CHECK,CHECK-BE
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// RUN: %clang -S -emit-llvm -target powerpc64le-unknown-linux-gnu -mcpu=pwr8 -ffreestanding -DNO_WARN_X86_INTRINSICS %s \
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// RUN: -ffp-contract=off -fno-discard-value-names -mllvm -disable-llvm-optzns -o - | llvm-cxxfilt -n | FileCheck %s --check-prefixes=CHECK,CHECK-LE
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// RUN: -fno-discard-value-names -mllvm -disable-llvm-optzns -o - | llvm-cxxfilt -n | FileCheck %s --check-prefixes=CHECK,CHECK-LE
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#include <xmmintrin.h>
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@@ -1,87 +1,85 @@
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// Test that incompatible combinations of -ffp-model= options
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// and other floating point options get a warning diagnostic.
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//
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// REQUIRES: clang-driver
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// RUN: %clang -target x86_64 -### -ffp-model=fast -ffp-contract=off -c %s 2>&1 \
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// RUN: %clang -### -ffp-model=fast -ffp-contract=off -c %s 2>&1 \
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// RUN: | FileCheck --check-prefix=WARN %s
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// WARN: warning: overriding '-ffp-model=fast' option with '-ffp-contract=off' [-Woverriding-t-option]
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// RUN: %clang -target x86_64 -### -ffp-model=fast -ffp-contract=on -c %s 2>&1 \
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// RUN: %clang -### -ffp-model=fast -ffp-contract=on -c %s 2>&1 \
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// RUN: | FileCheck --check-prefix=WARN1 %s
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// WARN1: warning: overriding '-ffp-model=fast' option with '-ffp-contract=on' [-Woverriding-t-option]
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// RUN: %clang -target x86_64 -### -ffp-model=strict -fassociative-math -c %s 2>&1 \
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// RUN: %clang -### -ffp-model=strict -fassociative-math -c %s 2>&1 \
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// RUN: | FileCheck --check-prefix=WARN2 %s
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// WARN2: warning: overriding '-ffp-model=strict' option with '-fassociative-math' [-Woverriding-t-option]
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// RUN: %clang -target x86_64 -### -ffp-model=strict -ffast-math -c %s 2>&1 \
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// RUN: %clang -### -ffp-model=strict -ffast-math -c %s 2>&1 \
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// RUN: | FileCheck --check-prefix=WARN3 %s
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// WARN3: warning: overriding '-ffp-model=strict' option with '-ffast-math' [-Woverriding-t-option]
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// RUN: %clang -target x86_64 -### -ffp-model=strict -ffinite-math-only -c %s 2>&1 \
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// RUN: %clang -### -ffp-model=strict -ffinite-math-only -c %s 2>&1 \
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// RUN: | FileCheck --check-prefix=WARN4 %s
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// WARN4: warning: overriding '-ffp-model=strict' option with '-ffinite-math-only' [-Woverriding-t-option]
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// RUN: %clang -target x86_64 -### -ffp-model=strict -ffp-contract=fast -c %s 2>&1 \
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// RUN: %clang -### -ffp-model=strict -ffp-contract=fast -c %s 2>&1 \
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// RUN: | FileCheck --check-prefix=WARN5 %s
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// WARN5: warning: overriding '-ffp-model=strict' option with '-ffp-contract=fast' [-Woverriding-t-option]
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// RUN: %clang -target x86_64 -### -ffp-model=strict -ffp-contract=fast -c %s 2>&1 \
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// RUN: | FileCheck --check-prefix=WARN6 %s
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// WARN6: warning: overriding '-ffp-model=strict' option with '-ffp-contract=fast' [-Woverriding-t-option]
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// RUN: %clang -target x86_64 -### -ffp-model=strict -ffp-contract=on -c %s 2>&1 \
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// RUN: %clang -### -ffp-model=strict -ffp-contract=on -c %s 2>&1 \
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// RUN: | FileCheck --check-prefix=WARN7 %s
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// WARN7: warning: overriding '-ffp-model=strict' option with '-ffp-contract=on' [-Woverriding-t-option]
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// RUN: %clang -target x86_64 -### -ffp-model=strict -fno-honor-infinities -c %s 2>&1 \
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// RUN: %clang -### -ffp-model=strict -fno-honor-infinities -c %s 2>&1 \
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// RUN: | FileCheck --check-prefix=WARN8 %s
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// WARN8: warning: overriding '-ffp-model=strict' option with '-fno-honor-infinities' [-Woverriding-t-option]
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// RUN: %clang -target x86_64 -### -ffp-model=strict -fno-honor-nans -c %s 2>&1 \
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// RUN: %clang -### -ffp-model=strict -fno-honor-nans -c %s 2>&1 \
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// RUN: | FileCheck --check-prefix=WARN9 %s
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// WARN9: warning: overriding '-ffp-model=strict' option with '-fno-honor-nans' [-Woverriding-t-option]
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// RUN: %clang -target x86_64 -### -ffp-model=strict -fno-rounding-math -c %s 2>&1 \
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// RUN: %clang -### -ffp-model=strict -fno-rounding-math -c %s 2>&1 \
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// RUN: | FileCheck --check-prefix=WARNa %s
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// WARNa: warning: overriding '-ffp-model=strict' option with '-fno-rounding-math' [-Woverriding-t-option]
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// RUN: %clang -target x86_64 -### -ffp-model=strict -fno-signed-zeros -c %s 2>&1 \
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// RUN: %clang -### -ffp-model=strict -fno-signed-zeros -c %s 2>&1 \
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// RUN: | FileCheck --check-prefix=WARNb %s
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// WARNb: warning: overriding '-ffp-model=strict' option with '-fno-signed-zeros' [-Woverriding-t-option]
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// RUN: %clang -target x86_64 -### -ffp-model=strict -fno-trapping-math -c %s 2>&1 \
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// RUN: %clang -### -ffp-model=strict -fno-trapping-math -c %s 2>&1 \
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// RUN: | FileCheck --check-prefix=WARNc %s
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// WARNc: warning: overriding '-ffp-model=strict' option with '-fno-trapping-math' [-Woverriding-t-option]
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// RUN: %clang -target x86_64 -### -ffp-model=strict -freciprocal-math -c %s 2>&1 \
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// RUN: %clang -### -ffp-model=strict -freciprocal-math -c %s 2>&1 \
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// RUN: | FileCheck --check-prefix=WARNd %s
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// WARNd: warning: overriding '-ffp-model=strict' option with '-freciprocal-math' [-Woverriding-t-option]
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// RUN: %clang -target x86_64 -### -ffp-model=strict -funsafe-math-optimizations -c %s 2>&1 \
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// RUN: %clang -### -ffp-model=strict -funsafe-math-optimizations -c %s 2>&1 \
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// RUN: | FileCheck --check-prefix=WARNe %s
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// WARNe: warning: overriding '-ffp-model=strict' option with '-funsafe-math-optimizations' [-Woverriding-t-option]
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// RUN: %clang -target x86_64 -### -ffp-model=strict -Ofast -c %s 2>&1 \
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// RUN: %clang -### -ffp-model=strict -Ofast -c %s 2>&1 \
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// RUN: | FileCheck --check-prefix=WARNf %s
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// WARNf: warning: overriding '-ffp-model=strict' option with '-Ofast' [-Woverriding-t-option]
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||||
|
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// RUN: %clang -target x86_64 -### -c %s 2>&1 \
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// RUN: %clang -### -c %s 2>&1 \
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// RUN: | FileCheck --check-prefix=CHECK-NOROUND %s
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// CHECK-NOROUND: "-cc1"
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// CHECK-NOROUND: "-fno-rounding-math"
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// RUN: %clang -target x86_64 -### -frounding-math -c %s 2>&1 \
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// RUN: %clang -### -frounding-math -c %s 2>&1 \
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// RUN: | FileCheck --check-prefix=CHECK-ROUND --implicit-check-not ffp-exception-behavior=strict %s
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// CHECK-ROUND: "-cc1"
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// CHECK-ROUND: "-frounding-math"
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|
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// RUN: %clang -target x86_64 -### -ftrapping-math -c %s 2>&1 \
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// RUN: %clang -### -ftrapping-math -c %s 2>&1 \
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// RUN: | FileCheck --check-prefix=CHECK-TRAP %s
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// CHECK-TRAP: "-cc1"
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// CHECK-TRAP: "-ftrapping-math"
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||||
// CHECK-TRAP: "-ffp-exception-behavior=strict"
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|
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// RUN: %clang -target x86_64 -### -nostdinc -ffp-model=fast -c %s 2>&1 \
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// RUN: %clang -### -nostdinc -ffp-model=fast -c %s 2>&1 \
|
||||
// RUN: | FileCheck --check-prefix=CHECK-FPM-FAST %s
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// CHECK-FPM-FAST: "-cc1"
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// CHECK-FPM-FAST: "-menable-no-infs"
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@@ -95,41 +93,41 @@
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// CHECK-FPM-FAST: "-ffast-math"
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// CHECK-FPM-FAST: "-ffinite-math-only"
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||||
|
||||
// RUN: %clang -target x86_64 -### -nostdinc -ffp-model=precise -c %s 2>&1 \
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||||
// RUN: %clang -### -nostdinc -ffp-model=precise -c %s 2>&1 \
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||||
// RUN: | FileCheck --check-prefix=CHECK-FPM-PRECISE %s
|
||||
// CHECK-FPM-PRECISE: "-cc1"
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||||
// CHECK-FPM-PRECISE: "-ffp-contract=on"
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||||
// CHECK-FPM-PRECISE: "-ffp-contract=fast"
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||||
// CHECK-FPM-PRECISE: "-fno-rounding-math"
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||||
|
||||
// RUN: %clang -target x86_64 -### -nostdinc -ffp-model=strict -c %s 2>&1 \
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||||
// RUN: %clang -### -nostdinc -ffp-model=strict -c %s 2>&1 \
|
||||
// RUN: | FileCheck --check-prefix=CHECK-FPM-STRICT %s
|
||||
// CHECK-FPM-STRICT: "-cc1"
|
||||
// CHECK-FPM-STRICT: "-ftrapping-math"
|
||||
// CHECK-FPM-STRICT: "-ffp-contract=off"
|
||||
// CHECK-FPM-STRICT: "-frounding-math"
|
||||
// CHECK-FPM-STRICT: "-ffp-exception-behavior=strict"
|
||||
|
||||
// RUN: %clang -target x86_64 -### -nostdinc -ftrapping-math -ffp-exception-behavior=ignore -c %s 2>&1 \
|
||||
// RUN: %clang -### -nostdinc -ftrapping-math -ffp-exception-behavior=ignore -c %s 2>&1 \
|
||||
// RUN: | FileCheck --check-prefix=CHECK-TRAP-IGNORE %s
|
||||
// CHECK-TRAP-IGNORE: "-cc1"
|
||||
// CHECK-TRAP-IGNORE: "-fno-rounding-math"
|
||||
// CHECK-TRAP-IGNORE: "-ffp-exception-behavior=ignore"
|
||||
|
||||
|
||||
// RUN: %clang -target x86_64 -### -nostdinc -ffp-exception-behavior=strict -c %s 2>&1 \
|
||||
// RUN: %clang -### -nostdinc -ffp-exception-behavior=strict -c %s 2>&1 \
|
||||
// RUN: | FileCheck --check-prefix=CHECK-FEB-STRICT %s
|
||||
// CHECK-FEB-STRICT: "-cc1"
|
||||
// CHECK-FEB-STRICT: "-fno-rounding-math"
|
||||
// CHECK-FEB-STRICT: "-ffp-exception-behavior=strict"
|
||||
|
||||
// RUN: %clang -target x86_64 -### -nostdinc -ffp-exception-behavior=maytrap -c %s 2>&1 \
|
||||
// RUN: %clang -### -nostdinc -ffp-exception-behavior=maytrap -c %s 2>&1 \
|
||||
// RUN: | FileCheck --check-prefix=CHECK-FEB-MAYTRAP %s
|
||||
// CHECK-FEB-MAYTRAP: "-cc1"
|
||||
// CHECK-FEB-MAYTRAP: "-fno-rounding-math"
|
||||
// CHECK-FEB-MAYTRAP: "-ffp-exception-behavior=maytrap"
|
||||
|
||||
// RUN: %clang -target x86_64 -### -nostdinc -ffp-exception-behavior=ignore -c %s 2>&1 \
|
||||
// RUN: %clang -### -nostdinc -ffp-exception-behavior=ignore -c %s 2>&1 \
|
||||
// RUN: | FileCheck --check-prefix=CHECK-FEB-IGNORE %s
|
||||
// CHECK-FEB-IGNORE: "-cc1"
|
||||
// CHECK-FEB-IGNORE: "-fno-rounding-math"
|
||||
// CHECK-FEB-IGNORE: "-ffp-exception-behavior=ignore"
|
||||
|
||||
|
||||
Reference in New Issue
Block a user