81b106584f
This is a non-intrusive fix for https://bugs.llvm.org/show_bug.cgi?id=51476 intended for backport to the 13.x release branch. It expands on the current hack by distinguishing between CmpValue of 0, 1 and 2, where 0 and 1 have the obvious meaning and 2 means "anything else". The new optimization from D98564 should only be performed for CmpValue of 0 or 1. For main, I think we should switch the analyzeCompare() and optimizeCompare() APIs to use int64_t instead of int, which is in line with MachineOperand's notion of an immediate, and avoids this problem altogether. Differential Revision: https://reviews.llvm.org/D108076
36 lines
969 B
LLVM
36 lines
969 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
|
|
; RUN: llc -mtriple=aarch64-unknown-linux-gnu < %s | FileCheck %s
|
|
|
|
define void @test(i8 %arg) nounwind {
|
|
; CHECK-LABEL: test:
|
|
; CHECK: // %bb.0:
|
|
; CHECK-NEXT: str x30, [sp, #-16]! // 8-byte Folded Spill
|
|
; CHECK-NEXT: and w8, w0, #0xff
|
|
; CHECK-NEXT: cmp w8, #1
|
|
; CHECK-NEXT: cset w0, ne
|
|
; CHECK-NEXT: cmp w0, #3
|
|
; CHECK-NEXT: strb w0, [sp, #12]
|
|
; CHECK-NEXT: b.eq .LBB0_2
|
|
; CHECK-NEXT: // %bb.1: // %do_call
|
|
; CHECK-NEXT: bl unknown
|
|
; CHECK-NEXT: .LBB0_2: // %common.ret
|
|
; CHECK-NEXT: ldr x30, [sp], #16 // 8-byte Folded Reload
|
|
; CHECK-NEXT: ret
|
|
%tmp = alloca i8
|
|
%cmp1 = icmp ne i8 %arg, 1
|
|
%zext = zext i1 %cmp1 to i8
|
|
store i8 %zext, i8* %tmp
|
|
%zext2 = load i8, i8* %tmp
|
|
%cmp2 = icmp eq i8 %zext2, 3
|
|
br i1 %cmp2, label %exit, label %do_call
|
|
|
|
do_call:
|
|
call void @unknown(i8 %zext2)
|
|
ret void
|
|
|
|
exit:
|
|
ret void
|
|
}
|
|
|
|
declare void @unknown(i8)
|