mirror of
https://github.com/RPCS3/llvm.git
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e721f5c8d3
if (x != 0) x = 1
if (x == 1) x = 1
Previous codegen looks like this:
mov r1, r0
cmp r1, #1
mov r0, #0
moveq r0, #1
The naive lowering select between two different values. It should recognize the
test is equality test so it's more a conditional move rather than a select:
cmp r0, #1
movne r0, #0
rdar://9758317
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135017 91177308-0d34-0410-b5e6-96231b3b80d8
58 lines
1.2 KiB
LLVM
58 lines
1.2 KiB
LLVM
; RUN: llc < %s -march=thumb -mattr=+thumb2 -join-physregs | FileCheck %s
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; These tests implicitly depend on 'movs r0, #0' being rematerialized below the
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; test as 'mov.w r0, #0'. So far, that requires physreg joining.
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; 0x000000bb = 187
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define i1 @f2(i32 %a) {
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%tmp = xor i32 %a, 187
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%tmp1 = icmp eq i32 0, %tmp
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ret i1 %tmp1
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}
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; CHECK: f2:
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; CHECK: teq.w r0, #187
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; 0x00aa00aa = 11141290
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define i1 @f3(i32 %a) {
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%tmp = xor i32 %a, 11141290
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%tmp1 = icmp eq i32 %tmp, 0
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ret i1 %tmp1
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}
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; CHECK: f3:
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; CHECK: teq.w r0, #11141290
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; 0xcc00cc00 = 3422604288
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define i1 @f6(i32 %a) {
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%tmp = xor i32 %a, 3422604288
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%tmp1 = icmp eq i32 0, %tmp
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ret i1 %tmp1
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}
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; CHECK: f6:
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; CHECK: teq.w r0, #-872363008
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; 0xdddddddd = 3722304989
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define i1 @f7(i32 %a) {
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%tmp = xor i32 %a, 3722304989
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%tmp1 = icmp eq i32 %tmp, 0
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ret i1 %tmp1
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}
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; CHECK: f7:
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; CHECK: teq.w r0, #-572662307
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; 0xdddddddd = 3722304989
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define i1 @f8(i32 %a) {
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%tmp = xor i32 %a, 3722304989
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%tmp1 = icmp ne i32 0, %tmp
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ret i1 %tmp1
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}
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; 0x00110000 = 1114112
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define i1 @f10(i32 %a) {
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%tmp = xor i32 %a, 1114112
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%tmp1 = icmp eq i32 0, %tmp
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ret i1 %tmp1
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}
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; CHECK: f10:
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; CHECK: teq.w r0, #1114112
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