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llvm-mirror/test/CodeGen/ARM/sub.ll
Jim Grosbach e2d1ecbe70 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

llvm-svn: 108339
2010-07-14 17:45:16 +00:00

30 lines
543 B
LLVM

; RUN: llc -march=arm < %s | FileCheck %s
; 171 = 0x000000ab
define i64 @f1(i64 %a) {
; CHECK: f1
; CHECK: subs r0, r0, #171
; CHECK: sbc r1, r1, #0
%tmp = sub i64 %a, 171
ret i64 %tmp
}
; 66846720 = 0x03fc0000
define i64 @f2(i64 %a) {
; CHECK: f2
; CHECK: subs r0, r0, #255, 14
; CHECK: sbc r1, r1, #0
%tmp = sub i64 %a, 66846720
ret i64 %tmp
}
; 734439407618 = 0x000000ab00000002
define i64 @f3(i64 %a) {
; CHECK: f3
; CHECK: subs r0, r0, #2
; CHECK: sbc r1, r1, #171
%tmp = sub i64 %a, 734439407618
ret i64 %tmp
}