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author | Jim Grosbach <grosbach@apple.com> | 2010-07-14 17:45:16 +0000 |
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committer | Jim Grosbach <grosbach@apple.com> | 2010-07-14 17:45:16 +0000 |
commit | 502e0aa62833a1648d66c8f7edf5d21cf96c2f56 (patch) | |
tree | 61e13517a5fc09e2614aa36e360bda51ea553118 /test/CodeGen/Thumb2/thumb2-sub3.ll | |
parent | 2dd50e656f048d222aaaa57168688326fa52421b (diff) | |
download | llvm-502e0aa62833a1648d66c8f7edf5d21cf96c2f56.tar.gz llvm-502e0aa62833a1648d66c8f7edf5d21cf96c2f56.tar.bz2 llvm-502e0aa62833a1648d66c8f7edf5d21cf96c2f56.tar.xz |
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
Diffstat (limited to 'test/CodeGen/Thumb2/thumb2-sub3.ll')
-rw-r--r-- | test/CodeGen/Thumb2/thumb2-sub3.ll | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/test/CodeGen/Thumb2/thumb2-sub3.ll b/test/CodeGen/Thumb2/thumb2-sub3.ll new file mode 100644 index 0000000000..855ad06a63 --- /dev/null +++ b/test/CodeGen/Thumb2/thumb2-sub3.ll @@ -0,0 +1,55 @@ +; 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 +} |