--- /dev/null
+; RUN: opt < %s -passes=instcombine -S -mtriple=riscv64 | FileCheck %s
+;
+; Check that i32 arguments to generated libcalls have the proper extension
+; attributes.
+
+
+declare double @exp2(double)
+declare float @exp2f(float)
+declare fp128 @exp2l(fp128)
+
+define double @fun1(i32 %x) {
+; CHECK-LABEL: @fun1
+; CHECK: call double @ldexp
+ %conv = sitofp i32 %x to double
+ %ret = call double @exp2(double %conv)
+ ret double %ret
+}
+
+define float @fun2(i32 %x) {
+; CHECK-LABEL: @fun2
+; CHECK: call float @ldexpf
+ %conv = sitofp i32 %x to float
+ %ret = call float @exp2f(float %conv)
+ ret float %ret
+}
+
+define fp128 @fun3(i8 zeroext %x) {
+; CHECK-LABEL: @fun3
+; CHECK: call fp128 @ldexpl
+ %conv = uitofp i8 %x to fp128
+ %ret = call fp128 @exp2l(fp128 %conv)
+ ret fp128 %ret
+}
+
+@a = common global [60 x i8] zeroinitializer, align 1
+@b = common global [60 x i8] zeroinitializer, align 1
+declare ptr @__memccpy_chk(ptr, ptr, i32, i64, i64)
+define ptr @fun4() {
+; CHECK-LABEL: @fun4
+; CHECK: call ptr @memccpy
+ %ret = call ptr @__memccpy_chk(ptr @a, ptr @b, i32 0, i64 60, i64 -1)
+ ret ptr %ret
+}
+
+%FILE = type { }
+@A = constant [2 x i8] c"A\00"
+declare i32 @fputs(ptr, ptr)
+define void @fun5(ptr %fp) {
+; CHECK-LABEL: @fun5
+; CHECK: call i32 @fputc
+ call i32 @fputs(ptr @A, ptr %fp)
+ ret void
+}
+
+@empty = constant [1 x i8] zeroinitializer
+declare i32 @puts(ptr)
+define void @fun6() {
+; CHECK-LABEL: @fun6
+; CHECK: call i32 @putchar
+ call i32 @puts(ptr @empty)
+ ret void
+}
+
+@.str1 = private constant [2 x i8] c"a\00"
+declare ptr @strstr(ptr, ptr)
+define ptr @fun7(ptr %str) {
+; CHECK-LABEL: @fun7
+; CHECK: call ptr @strchr
+ %ret = call ptr @strstr(ptr %str, ptr @.str1)
+ ret ptr %ret
+}
+
+; CHECK: declare ptr @strchr(ptr, i32 signext)
+
+@hello = constant [14 x i8] c"hello world\5Cn\00"
+@chp = global ptr zeroinitializer
+declare ptr @strchr(ptr, i32)
+define void @fun8(i32 %chr) {
+; CHECK-LABEL: @fun8
+; CHECK: call ptr @memchr
+ %dst = call ptr @strchr(ptr @hello, i32 %chr)
+ store ptr %dst, ptr @chp
+ ret void
+}
+
+; CHECK: declare double @ldexp(double, i32 signext)
+; CHECK: declare float @ldexpf(float, i32 signext)
+; CHECK: declare fp128 @ldexpl(fp128, i32 signext)
+; CHECK: declare ptr @memccpy(ptr noalias writeonly, ptr noalias nocapture readonly, i32 signext, i64)
+; CHECK: declare noundef i32 @fputc(i32 noundef signext, ptr nocapture noundef)
+; CHECK: declare noundef i32 @putchar(i32 noundef signext)
+; CHECK: declare ptr @memchr(ptr, i32 signext, i64)