1 files changed, 46 insertions, 2 deletions
diff --git a/llvm/test/Transforms/InstCombine/select_arithmetic.ll b/llvm/test/Transforms/InstCombine/select_arithmetic.ll
index d33bbdd1d43..8fde7c0807e 100644
--- a/llvm/test/Transforms/InstCombine/select_arithmetic.ll
+++ b/llvm/test/Transforms/InstCombine/select_arithmetic.ll
@@ -3,17 +3,32 @@
 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
 
 ; Tests folding constants from two similar selects that feed a add
-define float @test1(i1 zeroext %arg) #0 {
+define float @test1a(i1 zeroext %arg) #0 {
   %tmp = select i1 %arg, float 5.000000e+00, float 6.000000e+00
   %tmp1 = select i1 %arg, float 1.000000e+00, float 9.000000e+00
   %tmp2 = fadd float %tmp, %tmp1
   ret float %tmp2
-; CHECK-LABEL: @test1(
+; CHECK-LABEL: @test1a(
 ; CHECK: %tmp2 = select i1 %arg, float 6.000000e+00, float 1.500000e+01
 ; CHECK-NOT: fadd
 ; CHECK: ret float %tmp2
 }
 
+; Tests folding multiple expression constants from similar selects that feed a adds
+define float @test1b(i1 zeroext %arg) #0 {
+  %tmp = select i1 %arg, float 5.000000e+00, float 6.000000e+00
+  %tmp1 = select i1 %arg, float 1.000000e+00, float 9.000000e+00
+  %tmp2 = select i1 %arg, float 2.500000e-01, float 4.000000e+00
+  %tmp3 = fadd float %tmp, %tmp1
+  %tmp4 = fadd float %tmp2, %tmp1
+  %tmp5 = fadd float %tmp4, %tmp3
+  ret float %tmp5
+; CHECK-LABEL: @test1b(
+; CHECK: %tmp5 = select i1 %arg, float 7.250000e+00, float 2.800000e+01
+; CHECK-NOT: fadd
+; CHECK: ret float %tmp5
+}
+
 ; Tests folding constants from two similar selects that feed a sub
 define float @test2(i1 zeroext %arg) #0 {
   %tmp = select i1 %arg, float 5.000000e+00, float 6.000000e+00
@@ -38,3 +53,32 @@ define float @test3(i1 zeroext %arg) #0 {
 ; CHECK: ret float %tmp2
 }
 
+declare void @use_float(float)
+
+; Tests folding constants if the selects have multiple uses but
+; we can fold away the binary op with a select.
+define float @test4(i1 zeroext %arg) #0 {
+  %tmp = select i1 %arg, float 5.000000e+00, float 6.000000e+00
+  %tmp1 = select i1 %arg, float 1.000000e+00, float 9.000000e+00
+  %tmp2 = fmul float %tmp, %tmp1
+  call void @use_float(float %tmp)
+  ret float %tmp2
+; CHECK-LABEL: @test4(
+; CHECK: select i1 %arg, float 5.000000e+00, float 6.000000e+00
+; CHECK-NEXT: select i1 %arg, float 5.000000e+00, float 5.400000e+01
+; CHECK-NEXT: call void @use_float(float %tmp)
+; CHECK: ret float %tmp2
+}
+
+; Tests not folding constants if we cannot fold away any of the selects.
+define float @test5(i1 zeroext %arg, float %div) {
+  %tmp = select i1 %arg, float %div, float 5.000000e+00
+  %mul = fmul contract float %tmp, %tmp
+  call void @use_float(float %tmp)
+  ret float %mul
+; CHECK-LABEL: @test5(
+; CHECK: [[TMP:%.*]] = select i1 %arg, float %div, float 5.000000e+00
+; CHECK-NEXT: [[MUL:%.*]] = fmul contract float [[TMP]], [[TMP]]
+; CHECK-NOT: fmul contract float %div, %div
+; CHECK: ret float [[MUL]]
+}