[llvm] r346136 - [InstCombine] add tests for select with FP identity op; NFC

[Sanjay Patel via llvm-commits]

Author: spatel
Date: Mon Nov  5 07:08:36 2018
New Revision: 346136

URL: http://llvm.org/viewvc/llvm-project?rev=346136&view=rev
Log:
[InstCombine] add tests for select with FP identity op; NFC

Modified:
    llvm/trunk/test/Transforms/InstCombine/select-binop-cmp.ll

Modified: llvm/trunk/test/Transforms/InstCombine/select-binop-cmp.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/select-binop-cmp.ll?rev=346136&r1=346135&r2=346136&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/select-binop-cmp.ll (original)
+++ llvm/trunk/test/Transforms/InstCombine/select-binop-cmp.ll Mon Nov  5 07:08:36 2018
@@ -166,6 +166,23 @@ define float @select_fadd_fcmp_2(float %
   ret float %C
 }
 
+; TODO: This is logically equivalent to the previous test - fcmp ignores the sign of 0.0.
+
+define float @select_fadd_fcmp_2_poszero(float %x, float %y, float %v) {
+; CHECK-LABEL: @select_fadd_fcmp_2_poszero(
+; CHECK-NEXT:    [[A:%.*]] = fcmp une float [[X:%.*]], 0.000000e+00
+; CHECK-NEXT:    [[Z:%.*]] = fadd float [[V:%.*]], 0.000000e+00
+; CHECK-NEXT:    [[B:%.*]] = fadd float [[Z]], [[X]]
+; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Y:%.*]], float [[B]]
+; CHECK-NEXT:    ret float [[C]]
+;
+  %A = fcmp une float %x, 0.0
+  %z = fadd float %v, 0.0 ; cannot produce -0.0
+  %B = fadd float %z, %x
+  %C = select i1 %A, float %y, float %B
+  ret float %C
+}
+
 define float @select_fadd_fcmp_3(float %x, float %y) {
 ; CHECK-LABEL: @select_fadd_fcmp_3(
 ; CHECK-NEXT:    [[A:%.*]] = fcmp une float [[X:%.*]], -0.000000e+00
@@ -178,6 +195,21 @@ define float @select_fadd_fcmp_3(float %
   ret float %C
 }
 
+; TODO: This is logically equivalent to the previous test - fcmp ignores the sign of 0.0.
+
+define float @select_fadd_fcmp_3_poszero(float %x, float %y) {
+; CHECK-LABEL: @select_fadd_fcmp_3_poszero(
+; CHECK-NEXT:    [[A:%.*]] = fcmp une float [[X:%.*]], 0.000000e+00
+; CHECK-NEXT:    [[B:%.*]] = fadd float [[X]], 6.000000e+00
+; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Y:%.*]], float [[B]]
+; CHECK-NEXT:    ret float [[C]]
+;
+  %A = fcmp une float %x, 0.0
+  %B = fadd float 6.0, %x
+  %C = select i1 %A, float %y, float %B
+  ret float %C
+}
+
 define float @select_fadd_fcmp_4(float %x, float %y, float %z) {
 ; CHECK-LABEL: @select_fadd_fcmp_4(
 ; CHECK-NEXT:    [[A:%.*]] = fcmp une float [[X:%.*]], -0.000000e+00
@@ -204,6 +236,23 @@ define float @select_fadd_fcmp_5(float %
   ret float %C
 }
 
+; TODO: This is logically equivalent to the previous test - fcmp ignores the sign of 0.0.
+
+define float @select_fadd_fcmp_5_poszero(float %x, float %y, float %v) {
+; CHECK-LABEL: @select_fadd_fcmp_5_poszero(
+; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 0.000000e+00
+; CHECK-NEXT:    [[Z:%.*]] = fadd float [[V:%.*]], 0.000000e+00
+; CHECK-NEXT:    [[B:%.*]] = fadd float [[Z]], [[X]]
+; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[B]], float [[Y:%.*]]
+; CHECK-NEXT:    ret float [[C]]
+;
+  %A = fcmp oeq float %x, 0.0
+  %z = fadd float %v, 0.0 ; cannot produce -0.0
+  %B = fadd float %z, %x
+  %C = select i1 %A, float %B, float %y
+  ret float %C
+}
+
 define float @select_fadd_fcmp_6(float %x, float %y, float %z) {
 ; CHECK-LABEL: @select_fadd_fcmp_6(
 ; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], -0.000000e+00
@@ -214,6 +263,21 @@ define float @select_fadd_fcmp_6(float %
   %B = fadd float %x, 6.0
   %C = select i1 %A, float %B, float %y
   ret float %C
+}
+
+; TODO: This is logically equivalent to the previous test - fcmp ignores the sign of 0.0.
+
+define float @select_fadd_fcmp_6_poszero(float %x, float %y, float %z) {
+; CHECK-LABEL: @select_fadd_fcmp_6_poszero(
+; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 0.000000e+00
+; CHECK-NEXT:    [[B:%.*]] = fadd float [[X]], 6.000000e+00
+; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[B]], float [[Y:%.*]]
+; CHECK-NEXT:    ret float [[C]]
+;
+  %A = fcmp oeq float %x, 0.0
+  %B = fadd float %x, 6.0
+  %C = select i1 %A, float %B, float %y
+  ret float %C
 }
 
 define float @select_fmul_fcmp(float %x, float %y, float %z) {