mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-11 23:05:31 +00:00
7b3f1a21ea
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91214 91177308-0d34-0410-b5e6-96231b3b80d8
59 lines
1.8 KiB
LLVM
59 lines
1.8 KiB
LLVM
; RUN: opt %s -instcombine -S | FileCheck %s
|
|
; PR5438
|
|
|
|
; TODO: This should also optimize down.
|
|
;define i32 @test1(i32 %a, i32 %b) nounwind readnone {
|
|
;entry:
|
|
; %0 = icmp sgt i32 %a, -1 ; <i1> [#uses=1]
|
|
; %1 = icmp slt i32 %b, 0 ; <i1> [#uses=1]
|
|
; %2 = xor i1 %1, %0 ; <i1> [#uses=1]
|
|
; %3 = zext i1 %2 to i32 ; <i32> [#uses=1]
|
|
; ret i32 %3
|
|
;}
|
|
|
|
; TODO: This optimizes partially but not all the way.
|
|
;define i32 @test2(i32 %a, i32 %b) nounwind readnone {
|
|
;entry:
|
|
; %0 = and i32 %a, 8 ;<i32> [#uses=1]
|
|
; %1 = and i32 %b, 8 ;<i32> [#uses=1]
|
|
; %2 = icmp eq i32 %0, %1 ;<i1> [#uses=1]
|
|
; %3 = zext i1 %2 to i32 ;<i32> [#uses=1]
|
|
; ret i32 %3
|
|
;}
|
|
|
|
define i32 @test3(i32 %a, i32 %b) nounwind readnone {
|
|
; CHECK: @test3
|
|
entry:
|
|
; CHECK: xor i32 %a, %b
|
|
; CHECK: lshr i32 %0, 31
|
|
; CHECK: xor i32 %1, 1
|
|
%0 = lshr i32 %a, 31 ; <i32> [#uses=1]
|
|
%1 = lshr i32 %b, 31 ; <i32> [#uses=1]
|
|
%2 = icmp eq i32 %0, %1 ; <i1> [#uses=1]
|
|
%3 = zext i1 %2 to i32 ; <i32> [#uses=1]
|
|
ret i32 %3
|
|
; CHECK-NOT: icmp
|
|
; CHECK-NOT: zext
|
|
; CHECK: ret i32 %2
|
|
}
|
|
|
|
; Variation on @test3: checking the 2nd bit in a situation where the 5th bit
|
|
; is one, not zero.
|
|
define i32 @test3i(i32 %a, i32 %b) nounwind readnone {
|
|
; CHECK: @test3i
|
|
entry:
|
|
; CHECK: xor i32 %a, %b
|
|
; CHECK: lshr i32 %0, 31
|
|
; CHECK: xor i32 %1, 1
|
|
%0 = lshr i32 %a, 29 ; <i32> [#uses=1]
|
|
%1 = lshr i32 %b, 29 ; <i32> [#uses=1]
|
|
%2 = or i32 %0, 35
|
|
%3 = or i32 %1, 35
|
|
%4 = icmp eq i32 %2, %3 ; <i1> [#uses=1]
|
|
%5 = zext i1 %4 to i32 ; <i32> [#uses=1]
|
|
ret i32 %5
|
|
; CHECK-NOT: icmp
|
|
; CHECK-NOT: zext
|
|
; CHECK: ret i32 %2
|
|
}
|