[Float2Int] Pre-commit test for ConstantRange bug. NFC

Author: topperc

llvm/test/Transforms/Float2Int/pr79158.ll

@@ -0,0 +1,19 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
+; RUN: opt < %s -passes=float2int -S | FileCheck %s
+
+define i32 @pr79158(i32 %x.i.0.x.i.0.x.0.x.0.x.0..i) {
+; CHECK-LABEL: define i32 @pr79158(
+; CHECK-SAME: i32 [[X_I_0_X_I_0_X_0_X_0_X_0__I:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP_I:%.*]] = icmp sgt i32 [[X_I_0_X_I_0_X_0_X_0_X_0__I]], 0
+; CHECK-NEXT:    [[TMP0:%.*]] = zext i1 [[CMP_I]] to i32
+; CHECK-NEXT:    [[MUL_I1:%.*]] = mul i32 [[TMP0]], 2147483647
+; CHECK-NEXT:    ret i32 [[MUL_I1]]
+;
+entry:
+  %cmp.i = icmp sgt i32 %x.i.0.x.i.0.x.0.x.0.x.0..i, 0
+  %conv.i = uitofp i1 %cmp.i to double
+  %mul.i = fmul double %conv.i, 0x41EFFFFFFFE00000
+  %conv1.i = fptoui double %mul.i to i32
+  ret i32 %conv1.i
+}