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| author | Andrew Trick <atrick@apple.com> | 2011-04-23 03:55:32 +0000 |
|---|---|---|
| committer | Andrew Trick <atrick@apple.com> | 2011-04-23 03:55:32 +0000 |
| commit | 1c3af779fc6b184204efd7e98dc16e475c251e7f (patch) | |
| tree | d9ca1d20f7c3930939492236cac207ad0c5e0fc9 /test/CodeGen/Thumb2/thumb2-sbc.ll | |
| parent | 1611bcd6acd685052eae9927f3ffbbfc917f1233 (diff) | |
| download | external_llvm-1c3af779fc6b184204efd7e98dc16e475c251e7f.zip external_llvm-1c3af779fc6b184204efd7e98dc16e475c251e7f.tar.gz external_llvm-1c3af779fc6b184204efd7e98dc16e475c251e7f.tar.bz2 | |
Thumb2 and ARM add/subtract with carry fixes.
Fixes Thumb2 ADCS and SBCS lowering: <rdar://problem/9275821>.
t2ADCS/t2SBCS are now pseudo instructions, consistent with ARM, so the
assembly printer correctly prints the 's' suffix.
Fixes Thumb2 adde -> SBC matching to check for live/dead carry flags.
Fixes the internal ARM machine opcode mnemonic for ADCS/SBCS.
Fixes ARM SBC lowering to check for live carry (potential bug).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130048 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/Thumb2/thumb2-sbc.ll')
| -rw-r--r-- | test/CodeGen/Thumb2/thumb2-sbc.ll | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/test/CodeGen/Thumb2/thumb2-sbc.ll b/test/CodeGen/Thumb2/thumb2-sbc.ll index 09e3fdd..f8d8d27 100644 --- a/test/CodeGen/Thumb2/thumb2-sbc.ll +++ b/test/CodeGen/Thumb2/thumb2-sbc.ll @@ -52,3 +52,18 @@ define i64 @f6(i64 %a) { ret i64 %tmp } +; Example from numerics code that manually computes wider-than-64 values. +; +; CHECK: _livecarry: +; CHECK: adds +; CHECK: adcs +; CHECK: adc +define i64 @livecarry(i64 %carry, i32 %digit) nounwind { + %ch = lshr i64 %carry, 32 + %cl = and i64 %carry, 4294967295 + %truncdigit = zext i32 %digit to i64 + %prod = add i64 %cl, %truncdigit + %ph = lshr i64 %prod, 32 + %carryresult = add i64 %ch, %ph + ret i64 %carryresult +} |