[InstSimplify] add tests for FP poison; NFC

Adapted from codegen tests seen in D75576.

diff --git a/llvm/test/Transforms/InstSimplify/fp-undef.ll b/llvm/test/Transforms/InstSimplify/fp-undef.ll
index 32d219c..1319c2e 100644 (file)
--- a/llvm/test/Transforms/InstSimplify/fp-undef.ll
+++ b/llvm/test/Transforms/InstSimplify/fp-undef.ll
@@ -162,3 +162,63 @@ define float @frem_undef_op1_fast(float %x) {
   %r = frem fast float %x, undef
   ret float %r
 }
+
+define double @fdiv_ninf_nan_op0(double %x) {
+; CHECK-LABEL: @fdiv_ninf_nan_op0(
+; CHECK-NEXT:    ret double 0xFFF8000000000000
+;
+  %r = fdiv ninf double 0xfff8000000000000, %x
+  ret double %r
+}
+
+define double @fadd_ninf_nan_op1(double %x) {
+; CHECK-LABEL: @fadd_ninf_nan_op1(
+; CHECK-NEXT:    ret double 0x7FF8000000000000
+;
+  %r = fadd ninf double %x, 0x7ff8000000000000
+  ret double %r
+}
+
+; TODO: Should simplify to undef.
+
+define double @fdiv_ninf_inf_op0(double %x) {
+; CHECK-LABEL: @fdiv_ninf_inf_op0(
+; CHECK-NEXT:    [[R:%.*]] = fdiv ninf double 0x7FF0000000000000, [[X:%.*]]
+; CHECK-NEXT:    ret double [[R]]
+;
+  %r = fdiv ninf double 0x7ff0000000000000, %x
+  ret double %r
+}
+
+; TODO: Should simplify to undef.
+
+define double @fadd_ninf_inf_op1(double %x) {
+; CHECK-LABEL: @fadd_ninf_inf_op1(
+; CHECK-NEXT:    [[R:%.*]] = fadd ninf double [[X:%.*]], 0xFFF0000000000000
+; CHECK-NEXT:    ret double [[R]]
+;
+  %r = fadd ninf double %x, 0xfff0000000000000
+  ret double %r
+}
+
+; TODO: Should simplify to inf.
+
+define double @fsub_nnan_inf_op0(double %x) {
+; CHECK-LABEL: @fsub_nnan_inf_op0(
+; CHECK-NEXT:    [[R:%.*]] = fsub nnan double 0x7FF0000000000000, [[X:%.*]]
+; CHECK-NEXT:    ret double [[R]]
+;
+  %r = fsub nnan double 0x7ff0000000000000, %x
+  ret double %r
+}
+
+; TODO: Should simplify to -inf.
+
+define double @fmul_nnan_inf_op1(double %x) {
+; CHECK-LABEL: @fmul_nnan_inf_op1(
+; CHECK-NEXT:    [[R:%.*]] = fmul nnan double [[X:%.*]], 0xFFF0000000000000
+; CHECK-NEXT:    ret double [[R]]
+;
+  %r = fmul nnan double %x, 0xfff0000000000000
+  ret double %r
+}