https://bugs.llvm.org/show_bug.cgi?id=50575
Bug ID: 50575
Summary: [InstCombine] remove unnecessary truncate
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Forking this off from bug 49543 - we can eliminate an intermediate cast in a
sequence like this by using 'ashr' to replicate the signbit:
define i64 @src(i32 %a0) {
%a = lshr i32 %a0, 24
%b = trunc i32 %a to i8
%c = sext i8 %b to i64
ret i64 %c
}
define i64 @tgt(i32 %a0) {
%a = ashr i32 %a0, 24
%c = sext i32 %a to i64
ret i64 %c
}
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