Imported Upstream version 5.18.0.225

Former-commit-id: 10196d987d5fc5564b9d3b33b1fdf13190f4d0b5

external/llvm/test/CodeGen/X86/change-unsafe-fp-math.ll

@@ -0,0 +1,56 @@
+; Check that we can enable/disable UnsafeFPMath via function attributes.  An
+; attribute on one function should not magically apply to the next one.
+
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown \
+; RUN:   | FileCheck %s --check-prefix=CHECK --check-prefix=SAFE
+
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -enable-unsafe-fp-math \
+; RUN:   | FileCheck %s --check-prefix=CHECK --check-prefix=UNSAFE
+
+; The div in these functions should be converted to a mul when unsafe-fp-math
+; is enabled.
+
+; CHECK-LABEL: unsafe_fp_math_default0:
+define double @unsafe_fp_math_default0(double %x) {
+; SAFE:      divsd
+; UNSAFE:    mulsd
+  %div = fdiv double %x, 2.0
+  ret double %div
+}
+
+; CHECK-LABEL: unsafe_fp_math_off:
+define double @unsafe_fp_math_off(double %x) #0 {
+; SAFE:      divsd
+; UNSAFE:    divsd
+  %div = fdiv double %x, 2.0
+  ret double %div
+}
+
+; CHECK-LABEL: unsafe_fp_math_default1:
+define double @unsafe_fp_math_default1(double %x) {
+; With unsafe math enabled, can change this div to a mul.
+; SAFE:      divsd
+; UNSAFE:    mulsd
+  %div = fdiv double %x, 2.0
+  ret double %div
+}
+
+; CHECK-LABEL: unsafe_fp_math_on:
+define double @unsafe_fp_math_on(double %x) #1 {
+; SAFE:      mulsd
+; UNSAFE:    mulsd
+  %div = fdiv double %x, 2.0
+  ret double %div
+}
+
+; CHECK-LABEL: unsafe_fp_math_default2:
+define double @unsafe_fp_math_default2(double %x) {
+; With unsafe math enabled, can change this div to a mul.
+; SAFE:      divsd
+; UNSAFE:    mulsd
+  %div = fdiv double %x, 2.0
+  ret double %div
+}
+
+attributes #0 = { "unsafe-fp-math"="false" }
+attributes #1 = { "unsafe-fp-math"="true" }