llvm-6502/test/CodeGen/Thumb2/thumb2-tst.ll
Evan Cheng e721f5c8d3 Improve codegen for select's:
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
2011-07-13 00:42:17 +00:00

50 lines
1.1 KiB
LLVM

; RUN: llc < %s -march=thumb -mattr=+thumb2 -join-physregs | FileCheck %s
; These tests implicitly depend on 'movs r0, #0' being rematerialized below the
; tst as 'mov.w r0, #0'. So far, that requires physreg joining.
; 0x000000bb = 187
define i1 @f2(i32 %a) {
%tmp = and i32 %a, 187
%tmp1 = icmp eq i32 0, %tmp
ret i1 %tmp1
}
; CHECK: f2:
; CHECK: tst.w r0, #187
; 0x00aa00aa = 11141290
define i1 @f3(i32 %a) {
%tmp = and i32 %a, 11141290
%tmp1 = icmp eq i32 %tmp, 0
ret i1 %tmp1
}
; CHECK: f3:
; CHECK: tst.w r0, #11141290
; 0xcc00cc00 = 3422604288
define i1 @f6(i32 %a) {
%tmp = and i32 %a, 3422604288
%tmp1 = icmp eq i32 0, %tmp
ret i1 %tmp1
}
; CHECK: f6:
; CHECK: tst.w r0, #-872363008
; 0xdddddddd = 3722304989
define i1 @f7(i32 %a) {
%tmp = and i32 %a, 3722304989
%tmp1 = icmp eq i32 %tmp, 0
ret i1 %tmp1
}
; CHECK: f7:
; CHECK: tst.w r0, #-572662307
; 0x00110000 = 1114112
define i1 @f10(i32 %a) {
%tmp = and i32 %a, 1114112
%tmp1 = icmp eq i32 0, %tmp
ret i1 %tmp1
}
; CHECK: f10:
; CHECK: tst.w r0, #1114112