https://bugs.llvm.org/show_bug.cgi?id=45628
Bug ID: 45628
Summary: PPC vector fails to optimize shift (used bits)
Product: new-bugs
Version: trunk
Hardware: Macintosh
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
https://godbolt.org/z/KZwVRg
// Type your code here, or load an example.
#include <altivec.h>
typedef vector unsigned __int128 block;
typedef vector unsigned long long vector2_u64;
block swap_with_shift(block num) {
return num << 64 | num >> 64;
}
block swap_without_shift(block num) {
vector unsigned long long ret;
ret[0] = ((vector2_u64)num)[1];
ret[1] = ((vector2_u64)num)[0];
return (block)ret;
}
typedef unsigned __int128 u128;
u128 swap_scalar(u128 in) {
return in << 64 | in >> 64;
}
swap_with_shift: # @swap_with_shift
xxspltd 35, 34, 1
xxswapd 34, 34
xxlxor 0, 0, 0
xxpermdi 35, 35, 0, 1
xxpermdi 34, 0, 34, 1
xxlor 34, 35, 34
blr
.long 0
.quad 0
swap_without_shift: # @swap_without_shift
xxswapd 34, 34
blr
.long 0
.quad 0
swap_scalar: # @swap_scalar
mr 5, 3
mr 3, 4
mr 4, 5
blr
.long 0
.quad 0
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