084f967370
The result of sign_extend_inreg needs to have as many sign bits as requested by the VT argument. The easiest way to guarantee this is to fold it to 0. SystemZ test was modified to avoid using undef. Fixes https://github.com/llvm/llvm-project/issues/55178 Reviewed By: RKSimon Differential Revision: https://reviews.llvm.org/D124696
21 lines
616 B
LLVM
21 lines
616 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
|
|
; RUN: llc < %s -mtriple=aarch64-unknown-linux-gnu | FileCheck %s
|
|
|
|
; This used to generate incorrect code because we sign extended
|
|
; the undef to undef instead of to 0.
|
|
|
|
define i1 @test14(i8 %X) {
|
|
; CHECK-LABEL: test14:
|
|
; CHECK: // %bb.0:
|
|
; CHECK-NEXT: mov w8, #-113
|
|
; CHECK-NEXT: // kill: def $w0 killed $w0 def $x0
|
|
; CHECK-NEXT: lsl w8, w8, w0
|
|
; CHECK-NEXT: sxtb w8, w8
|
|
; CHECK-NEXT: cmp w8, #0
|
|
; CHECK-NEXT: cset w0, gt
|
|
; CHECK-NEXT: ret
|
|
%1 = shl i8 -113, %X
|
|
%cmp = icmp slt i8 undef, %1
|
|
ret i1 %cmp
|
|
}
|