https://bugs.llvm.org/show_bug.cgi?id=51748
Bug ID: 51748
Summary: Unrecognized rotate patterns
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: david.bolvan...@gmail.com
CC: llvm-bugs@lists.llvm.org
unsigned rol1(unsigned x, int y)
{
return (x << y) | (x >> (64-y));
}
define dso_local i32 @rol1(i32 %0, i32 %1) local_unnamed_addr #0 {
%3 = shl i32 %0, %1
%4 = sub nsw i32 64, %1
%5 = lshr i32 %0, %4
%6 = or i32 %5, %3
ret i32 %6
}
--------------------------------
define i32 @src(i32 %0, i32 %1) {
%2:
%3 = shl i32 %0, %1
%4 = sub nsw i32 64, %1
%5 = lshr i32 %0, %4
%6 = or i32 %5, %3
ret i32 %6
}
=>
define i32 @tgt(i32 %0, i32 %1) {
%2:
%3 = fshl i32 %0, i32 %0, i32 %1
ret i32 %3
}
https://alive2.llvm.org/ce/z/6jDaR_
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