mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-14 11:32:34 +00:00
37fa1c81ac
The test case feeds the following into InstCombine's visitSelect: %tobool8 = icmp ne i32 0, 0 %phitmp = select i1 %tobool8, i32 3, i32 0 Then instcombine replaces the right side of the switch with 0, doesn't notice that nothing changes and tries again indefinitely. This fixes PR12897. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157587 91177308-0d34-0410-b5e6-96231b3b80d8
40 lines
1.1 KiB
LLVM
40 lines
1.1 KiB
LLVM
; RUN: opt -S -instcombine < %s | FileCheck %s
|
|
|
|
@c = common global i8 0, align 1
|
|
@a = common global i8 0, align 1
|
|
@b = common global i8 0, align 1
|
|
|
|
define void @func() nounwind uwtable ssp {
|
|
entry:
|
|
%0 = load i8* @c, align 1
|
|
%conv = zext i8 %0 to i32
|
|
%or = or i32 %conv, 1
|
|
%conv1 = trunc i32 %or to i8
|
|
store i8 %conv1, i8* @a, align 1
|
|
%conv2 = zext i8 %conv1 to i32
|
|
%neg = xor i32 %conv2, -1
|
|
%and = and i32 1, %neg
|
|
%conv3 = trunc i32 %and to i8
|
|
store i8 %conv3, i8* @b, align 1
|
|
%1 = load i8* @a, align 1
|
|
%conv4 = zext i8 %1 to i32
|
|
%conv5 = zext i8 %conv3 to i32
|
|
%tobool = icmp ne i32 %conv4, 0
|
|
br i1 %tobool, label %land.rhs, label %land.end
|
|
|
|
land.rhs: ; preds = %entry
|
|
%tobool8 = icmp ne i32 %conv5, 0
|
|
br label %land.end
|
|
|
|
land.end: ; preds = %land.rhs, %entry
|
|
%2 = phi i1 [ false, %entry ], [ %tobool8, %land.rhs ]
|
|
%land.ext = zext i1 %2 to i32
|
|
%mul = mul nsw i32 3, %land.ext
|
|
%conv9 = trunc i32 %mul to i8
|
|
store i8 %conv9, i8* @a, align 1
|
|
ret void
|
|
|
|
; CHECK: @func
|
|
; CHECK-NOT: select
|
|
}
|