mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-21 00:32:23 +00:00
e3d920699c
LowerSubregs, and fix an x86-64 isel bug that this exposed. SUBREG_TO_REG for x86-64 implicit zero extension is only safe for isel to generate when the source is known to always have zeros in the high 32 bits. The EXTRACT_SUBREG instruction does not clear the high 32 bits. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54444 91177308-0d34-0410-b5e6-96231b3b80d8
11 lines
265 B
LLVM
11 lines
265 B
LLVM
; RUN: llvm-as < %s | llc -march=x86-64 | grep {movl %e.\*, %e.\*} | count 1
|
|
|
|
; Don't eliminate or coalesce away the explicit zero-extension!
|
|
|
|
define i64 @foo(i64 %a) {
|
|
%b = add i64 %a, 4294967295
|
|
%c = and i64 %b, 4294967295
|
|
%d = add i64 %c, 1
|
|
ret i64 %d
|
|
}
|