84a9ec2ff1
There are currently two options that are used to tell the compiler to perform unsafe floating-point optimizations: '-ffast-math' and '-funsafe-math-optimizations'. '-ffast-math' is enabled by default. It automatically enables the driver option '-menable-unsafe-fp-math'. Below is a table illustrating the special operations enabled automatically by '-ffast-math', '-funsafe-math-optimizations' and '-menable-unsafe-fp-math' respectively. Special Operations -ffast-math -funsafe-math-optimizations -menable-unsafe-fp-math MathErrno 0 1 1 FiniteMathOnly 1 0 0 AllowFPReassoc 1 1 1 NoSignedZero 1 1 1 AllowRecip 1 1 1 ApproxFunc 1 1 1 RoundingMath 0 0 0 UnsafeFPMath 1 0 1 FPContract fast on on '-ffast-math' enables '-fno-math-errno', '-ffinite-math-only', '-funsafe-math-optimzations' and sets 'FpContract' to 'fast'. The driver option '-menable-unsafe-fp-math' enables the same special options than '-funsafe-math-optimizations'. This is redundant. We propose to remove the driver option '-menable-unsafe-fp-math' and use instead, the setting of the special operations to set the function attribute 'unsafe-fp-math'. This attribute will be enabled only if those special operations are enabled and if 'FPContract' is either 'fast' or set to the default value. Differential Revision: https://reviews.llvm.org/D135097
84 lines
2.7 KiB
Plaintext
84 lines
2.7 KiB
Plaintext
// Check that when we link a bitcode module into a file using
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// -mlink-builtin-bitcode, we apply the same attributes to the functions in that
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// bitcode module as we apply to functions we generate.
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//
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// In particular, we check that ftz and unsafe-math are propagated into the
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// bitcode library as appropriate.
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// Build the bitcode library. This is not built in CUDA mode, otherwise it
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// might have incompatible attributes. This mirrors how libdevice is built.
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// RUN: %clang_cc1 -x c++ -fconvergent-functions -emit-llvm-bc -DLIB \
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// RUN: %s -o %t.bc -triple nvptx-unknown-unknown
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// RUN: %clang_cc1 -x cuda %s -emit-llvm -mlink-builtin-bitcode %t.bc -o - \
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// RUN: -fcuda-is-device -triple nvptx-unknown-unknown \
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// RUN: | FileCheck %s --check-prefix=CHECK --check-prefix=NOFTZ --check-prefix=NOFAST
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// RUN: %clang_cc1 -x cuda %s -emit-llvm -mlink-builtin-bitcode %t.bc \
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// RUN: -fdenormal-fp-math-f32=preserve-sign -o - \
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// RUN: -fcuda-is-device -triple nvptx-unknown-unknown \
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// RUN: | FileCheck %s --check-prefix=CHECK --check-prefix=FTZ \
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// RUN: --check-prefix=NOFAST
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// RUN: %clang_cc1 -x cuda %s -emit-llvm -mlink-builtin-bitcode %t.bc \
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// RUN: -fdenormal-fp-math-f32=preserve-sign -o - \
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// RUN: -fcuda-is-device -funsafe-math-optimizations -triple nvptx-unknown-unknown \
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// RUN: | FileCheck %s --check-prefix=CHECK --check-prefix=FAST
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// Wrap everything in extern "C" so we don't have to worry about name mangling
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// in the IR.
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extern "C" {
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#ifdef LIB
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// This function is defined in the library and only declared in the main
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// compilation.
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void lib_fn() {}
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#else
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#include "Inputs/cuda.h"
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__device__ void lib_fn();
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__global__ void kernel() { lib_fn(); }
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#endif
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}
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// The kernel and lib function should have the same attributes.
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// CHECK: define{{.*}} void @kernel() [[kattr:#[0-9]+]]
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// CHECK: define internal void @lib_fn() [[fattr:#[0-9]+]]
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// FIXME: These -NOT checks do not work as intended and do not check on the same
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// line.
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// Check the attribute list for kernel.
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// CHECK: attributes [[kattr]] = {
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// CHECK-SAME: convergent
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// CHECK-SAME: norecurse
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// FTZ-NOT: "denormal-fp-math"
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// FTZ-SAME: "denormal-fp-math-f32"="preserve-sign,preserve-sign"
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// NOFTZ-NOT: "denormal-fp-math-f32"
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// CHECK-SAME: "no-trapping-math"="true"
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// FAST-SAME: "unsafe-fp-math"="true"
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// NOFAST-NOT: "unsafe-fp-math"="true"
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// Check the attribute list for lib_fn.
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// CHECK: attributes [[fattr]] = {
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// CHECK-SAME: convergent
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// CHECK-NOT: norecurse
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// FTZ-NOT: "denormal-fp-math"
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// NOFTZ-NOT: "denormal-fp-math"
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// FTZ-SAME: "denormal-fp-math-f32"="preserve-sign,preserve-sign"
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// NOFTZ-NOT: "denormal-fp-math-f32"
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// CHECK-SAME: "no-trapping-math"="true"
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// FAST-SAME: "unsafe-fp-math"="true"
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// NOFAST-NOT: "unsafe-fp-math"="true"
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