1 files changed, 72 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/fmul.ll b/test/Transforms/InstCombine/fmul.ll
new file mode 100644
index 0000000..3671b4c
--- /dev/null
+++ b/test/Transforms/InstCombine/fmul.ll
@@ -0,0 +1,72 @@
+; RUN: opt -S -instcombine < %s | FileCheck %s
+
+; (-0.0 - X) * C => X * -C
+define float @test1(float %x) {
+  %sub = fsub float -0.000000e+00, %x
+  %mul = fmul float %sub, 2.0e+1
+  ret float %mul
+
+; CHECK: @test1
+; CHECK: fmul float %x, -2.000000e+01
+}
+
+; (0.0 - X) * C => X * -C
+define float @test2(float %x) {
+  %sub = fsub nsz float 0.000000e+00, %x
+  %mul = fmul float %sub, 2.0e+1
+  ret float %mul
+
+; CHECK: @test2
+; CHECK: fmul float %x, -2.000000e+01
+}
+
+; (-0.0 - X) * (-0.0 - Y) => X * Y
+define float @test3(float %x, float %y) {
+  %sub1 = fsub float -0.000000e+00, %x
+  %sub2 = fsub float -0.000000e+00, %y
+  %mul = fmul float %sub1, %sub2
+  ret float %mul
+; CHECK: @test3
+; CHECK: fmul float %x, %y
+}
+
+; (0.0 - X) * (0.0 - Y) => X * Y
+define float @test4(float %x, float %y) {
+  %sub1 = fsub nsz float 0.000000e+00, %x
+  %sub2 = fsub nsz float 0.000000e+00, %y
+  %mul = fmul float %sub1, %sub2
+  ret float %mul
+; CHECK: @test4
+; CHECK: fmul float %x, %y
+}
+
+; (-0.0 - X) * Y => -0.0 - (X * Y)
+define float @test5(float %x, float %y) {
+  %sub1 = fsub float -0.000000e+00, %x
+  %mul = fmul float %sub1, %y
+  ret float %mul
+; CHECK: @test5
+; CHECK: %1 = fmul float %x, %y
+; CHECK: %mul = fsub float -0.000000e+00, %1
+}
+
+; (0.0 - X) * Y => 0.0 - (X * Y)
+define float @test6(float %x, float %y) {
+  %sub1 = fsub nsz float 0.000000e+00, %x
+  %mul = fmul float %sub1, %y
+  ret float %mul
+; CHECK: @test6
+; CHECK: %1 = fmul float %x, %y
+; CHECK: %mul = fsub float -0.000000e+00, %1
+}
+
+; "(-0.0 - X) * Y => -0.0 - (X * Y)" is disabled if expression "-0.0 - X"
+; has multiple uses.
+define float @test7(float %x, float %y) {
+  %sub1 = fsub float -0.000000e+00, %x
+  %mul = fmul float %sub1, %y
+  %mul2 = fmul float %mul, %sub1
+  ret float %mul2
+; CHECK: @test7
+; CHECK: fsub float -0.000000e+00, %x
+}