[RISCV] Add test cases showing fli being used for negative min normalized value.

We can only use fli for the positive normalized value.

Author: topperc

llvm/test/CodeGen/RISCV/double-zfa.ll

@@ -152,6 +152,15 @@ define double @loadfpimm17() {
   ret double -2.0
 }
 
+; Ensure fli isn't incorrecty used for negative min normal value.
+define double @loadfpimm18() {
+; CHECK-LABEL: loadfpimm18:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    fli.d fa0, min
+; CHECK-NEXT:    ret
+  ret double 0x8010000000000000
+}
+
 declare double @llvm.minimum.f64(double, double)
 
 define double @fminm_d(double %a, double %b) nounwind {

llvm/test/CodeGen/RISCV/float-zfa.ll

@@ -106,6 +106,15 @@ define float @loadfpimm12() {
   ret float -2.0
 }
 
+; Ensure fli isn't incorrecty used for negative min normal value.
+define float @loadfpimm13() {
+; CHECK-LABEL: loadfpimm13:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    fli.s fa0, min
+; CHECK-NEXT:    ret
+  ret float 0xb810000000000000
+}
+
 declare float @llvm.minimum.f32(float, float)
 
 define float @fminm_s(float %a, float %b) nounwind {

llvm/test/CodeGen/RISCV/half-zfa-fli.ll

@@ -211,3 +211,19 @@ define half @loadfpimm14() {
 ; ZFHMIN-NEXT:    ret
   ret half -2.0
 }
+
+; Ensure fli isn't incorrecty used for negative min normal value.
+define half @loadfpimm15() {
+; CHECK-LABEL: loadfpimm15:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    fli.h fa0, min
+; CHECK-NEXT:    ret
+;
+; ZFHMIN-LABEL: loadfpimm15:
+; ZFHMIN:       # %bb.0:
+; ZFHMIN-NEXT:    lui a0, %hi(.LCPI14_0)
+; ZFHMIN-NEXT:    flh fa0, %lo(.LCPI14_0)(a0)
+; ZFHMIN-NEXT:    ret
+  ret half 0xH8400
+}
+