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llvm-6502/test/CodeGen/Thumb2/thumb2-sub3.ll
Jim Grosbach 502e0aa628 Improve 64-subtraction of immediates when parts of the immediate can fit
in the literal field of an instruction. E.g.,
long long foo(long long a) {
  return a - 734439407618LL;
}

rdar://7038284



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108339 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-14 17:45:16 +00:00

56 lines
1.1 KiB
LLVM

; RUN: llc -march=thumb -mattr=+thumb2 < %s | FileCheck %s
; 171 = 0x000000ab
define i64 @f1(i64 %a) {
; CHECK: f1
; CHECK: subs r0, #171
; CHECK: adc r1, r1, #-1
%tmp = sub i64 %a, 171
ret i64 %tmp
}
; 1179666 = 0x00120012
define i64 @f2(i64 %a) {
; CHECK: f2
; CHECK: subs.w r0, r0, #1179666
; CHECK: adc r1, r1, #-1
%tmp = sub i64 %a, 1179666
ret i64 %tmp
}
; 872428544 = 0x34003400
define i64 @f3(i64 %a) {
; CHECK: f3
; CHECK: subs.w r0, r0, #872428544
; CHECK: adc r1, r1, #-1
%tmp = sub i64 %a, 872428544
ret i64 %tmp
}
; 1448498774 = 0x56565656
define i64 @f4(i64 %a) {
; CHECK: f4
; CHECK: subs.w r0, r0, #1448498774
; CHECK: adc r1, r1, #-1
%tmp = sub i64 %a, 1448498774
ret i64 %tmp
}
; 66846720 = 0x03fc0000
define i64 @f5(i64 %a) {
; CHECK: f5
; CHECK: subs.w r0, r0, #66846720
; CHECK: adc r1, r1, #-1
%tmp = sub i64 %a, 66846720
ret i64 %tmp
}
; 734439407618 = 0x000000ab00000002
define i64 @f6(i64 %a) {
; CHECK: f6
; CHECK: subs r0, #2
; CHECK: sbc r1, r1, #171
%tmp = sub i64 %a, 734439407618
ret i64 %tmp
}