f5360d4bb3
Add support for #pragma float_control Reviewers: rjmccall, erichkeane, sepavloff Differential Revision: https://reviews.llvm.org/D72841 This reverts commit fce82c0ed310174fe48e2402ac731b6340098389.
48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm -o - %s | FileCheck %s
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float fff(float x, float y) {
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// CHECK-LABEL: define float @_Z3fffff{{.*}}
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// CHECK: entry
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#pragma float_control(except, on)
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float z;
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z = z * z;
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//CHECK: llvm.experimental.constrained.fmul{{.*}}
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{
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z = x * y;
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//CHECK: llvm.experimental.constrained.fmul{{.*}}
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}
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{
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// This pragma has no effect since if there are any fp intrin in the
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// function then all the operations need to be fp intrin
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#pragma float_control(except, off)
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z = z + x * y;
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//CHECK: llvm.experimental.constrained.fmul{{.*}}
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}
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z = z * z;
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//CHECK: llvm.experimental.constrained.fmul{{.*}}
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return z;
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}
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float check_precise(float x, float y) {
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// CHECK-LABEL: define float @_Z13check_preciseff{{.*}}
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float z;
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{
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#pragma float_control(precise, on)
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z = x * y + z;
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//CHECK: llvm.fmuladd{{.*}}
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}
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{
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#pragma float_control(precise, off)
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z = x * y + z;
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//CHECK: fmul fast float
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//CHECK: fadd fast float
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}
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return z;
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}
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float fma_test1(float a, float b, float c) {
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// CHECK-LABEL define float @_Z9fma_test1fff{{.*}}
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#pragma float_control(precise, on)
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float x = a * b + c;
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//CHECK: fmuladd
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return x;
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}
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