https://bugs.llvm.org/show_bug.cgi?id=49762
Bug ID: 49762
Summary: fptoui double to i16 produces fcvtzs (signed) instead
of fcvtzu (unsigned)
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: AArch64
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected],
[email protected], [email protected],
[email protected]
$ cat test.c
unsigned short func1(double d) {
return d;
};
unsigned int func2(double d) {
return d;
};
$ clang -target aarch64-linux-gnu test.c -S -o - -O2
func1: // @func1
.cfi_startproc
fcvtzs w0, d0
ret
func2: // @func2
.cfi_startproc
fcvtzu w0, d0
ret
When doing fptoui to i32, this selects a fcvtzu instruction, while it selects
fcvtzs when converting to i16. (I'm not sure if this is a bug per se, or if the
C/IR specs allows this, but if nothing else, it feels rather inconsistent.)
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