Imported Upstream version 5.18.0.247

Former-commit-id: 2d6af2e4ed0eda5cbdc2946446ef7718456ad190

external/llvm/test/Transforms/InstCombine/fsub.ll

@@ -1,67 +0,0 @@
-; RUN: opt < %s -instcombine -S | FileCheck %s
-
-; PR4374
-define float @test1(float %a, float %b) nounwind {
-  %t1 = fsub float %a, %b
-  %t2 = fsub float -0.000000e+00, %t1
-
-; CHECK:       %t1 = fsub float %a, %b
-; CHECK-NEXT:  %t2 = fsub float -0.000000e+00, %t1
-
-  ret float %t2
-}
-
-; <rdar://problem/7530098>
-define double @test2(double %x, double %y) nounwind {
-  %t1 = fadd double %x, %y
-  %t2 = fsub double %x, %t1
-
-; CHECK:      %t1 = fadd double %x, %y
-; CHECK-NEXT: %t2 = fsub double %x, %t1
-
-  ret double %t2
-}
-
-; CHECK-LABEL: @fsub_undef(
-; CHECK: %sub = fsub float %val, undef
-define float @fsub_undef(float %val) {
-bb:
-  %sub = fsub float %val, undef
-  ret float %sub
-}
-
-; XXX - Why doesn't this fold to undef?
-; CHECK-LABEL: @fsub_fast_undef(
-; CHCK: %sub = fsub fast float %val, undef
-define float @fsub_fast_undef(float %val) {
-bb:
-  %sub = fsub fast float %val, undef
-  ret float %sub
-}
-
-; CHECK-LABEL: @fneg_undef(
-; CHECK: ret float fsub (float -0.000000e+00, float undef)
-define float @fneg_undef(float %val) {
-bb:
-  %sub = fsub float -0.0, undef
-  ret float %sub
-}
-
-; CHECK-LABEL: @fneg_fast_undef(
-; CHECK: ret float fsub (float -0.000000e+00, float undef)
-define float @fneg_fast_undef(float %val) {
-bb:
-  %sub = fsub fast float -0.0, undef
-  ret float %sub
-}
-
-; This folds to a constant expression, which produced 0 instructions
-; contrary to the expected one for negation.
-; CHECK-LABEL: @inconsistent_numbers_fsub_undef(
-; CHECK: ret float fsub (float -0.000000e+00, float undef)
-define float @inconsistent_numbers_fsub_undef(float %val) {
-bb:
-  %sub0 = fsub fast float %val, undef
-  %sub1 = fsub fast float %sub0, %val
-  ret float %sub1
-}