Imported Upstream version 5.18.0.205

Former-commit-id: 7f59f7e792705db773f1caecdaa823092f4e2927

external/llvm/test/CodeGen/X86/negative-sin.ll

@@ -0,0 +1,99 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=avx | FileCheck %s
+
+declare double @sin(double %f)
+
+; When the subs are strict, they can't be removed because of signed zero.
+
+define double @strict(double %e) nounwind {
+; CHECK-LABEL: strict:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    pushq %rax
+; CHECK-NEXT:    vxorpd %xmm1, %xmm1, %xmm1
+; CHECK-NEXT:    vsubsd %xmm0, %xmm1, %xmm0
+; CHECK-NEXT:    callq sin
+; CHECK-NEXT:    vxorpd %xmm1, %xmm1, %xmm1
+; CHECK-NEXT:    vsubsd %xmm0, %xmm1, %xmm0
+; CHECK-NEXT:    popq %rax
+; CHECK-NEXT:    retq
+  %f = fsub double 0.0, %e
+  %g = call double @sin(double %f) readonly
+  %h = fsub double 0.0, %g
+  ret double %h
+}
+
+; 'fast' implies no-signed-zeros, so the negates fold away.
+; The 'sin' does not need any fast-math-flags for this transform.
+
+define double @fast(double %e) nounwind {
+; CHECK-LABEL: fast:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    jmp sin # TAILCALL
+  %f = fsub fast double 0.0, %e
+  %g = call double @sin(double %f) readonly
+  %h = fsub fast double 0.0, %g
+  ret double %h
+}
+
+; No-signed-zeros is all that we need for this transform.
+
+define double @nsz(double %e) nounwind {
+; CHECK-LABEL: nsz:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    jmp sin # TAILCALL
+  %f = fsub nsz double 0.0, %e
+  %g = call double @sin(double %f) readonly
+  %h = fsub nsz double 0.0, %g
+  ret double %h
+}
+
+; The 1st negate is strict, so we can't kill that sub, but the 2nd disappears.
+
+define double @semi_strict1(double %e) nounwind {
+; CHECK-LABEL: semi_strict1:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    pushq %rax
+; CHECK-NEXT:    vxorpd %xmm1, %xmm1, %xmm1
+; CHECK-NEXT:    vsubsd %xmm0, %xmm1, %xmm0
+; CHECK-NEXT:    callq sin
+; CHECK-NEXT:    vxorpd {{.*}}(%rip), %xmm0, %xmm0
+; CHECK-NEXT:    popq %rax
+; CHECK-NEXT:    retq
+  %f = fsub double 0.0, %e
+  %g = call double @sin(double %f) readonly
+  %h = fsub nsz double 0.0, %g
+  ret double %h
+}
+
+; The 2nd negate is strict, so we can't kill it. It becomes an add of zero instead.
+
+define double @semi_strict2(double %e) nounwind {
+; CHECK-LABEL: semi_strict2:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    pushq %rax
+; CHECK-NEXT:    callq sin
+; CHECK-NEXT:    vxorpd %xmm1, %xmm1, %xmm1
+; CHECK-NEXT:    vaddsd %xmm1, %xmm0, %xmm0
+; CHECK-NEXT:    popq %rax
+; CHECK-NEXT:    retq
+  %f = fsub nsz double 0.0, %e
+  %g = call double @sin(double %f) readonly
+  %h = fsub double 0.0, %g
+  ret double %h
+}
+
+; FIXME:
+; Auto-upgrade function attribute to IR-level fast-math-flags.
+
+define double @fn_attr(double %e) nounwind #0 {
+; CHECK-LABEL: fn_attr:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    jmp sin # TAILCALL
+  %f = fsub double 0.0, %e
+  %g = call double @sin(double %f) readonly
+  %h = fsub double 0.0, %g
+  ret double %h
+}
+
+attributes #0 = { "unsafe-fp-math"="true" "no-signed-zeros-fp-math"="true" }
+