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| author | Chris Lattner <sabre@nondot.org> | 2010-12-20 00:59:46 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2010-12-20 00:59:46 +0000 |
| commit | 5b85654844d673939bd1ceba66cd1f5022fd7c0d (patch) | |
| tree | 1436b025ce82e1fde48ed2c28e110db539d5b4f3 /lib/Target/X86/X86ISelLowering.h | |
| parent | 4d8455ea4d2950ca3e818c7e9ba14150286c039b (diff) | |
| download | external_llvm-5b85654844d673939bd1ceba66cd1f5022fd7c0d.zip external_llvm-5b85654844d673939bd1ceba66cd1f5022fd7c0d.tar.gz external_llvm-5b85654844d673939bd1ceba66cd1f5022fd7c0d.tar.bz2 | |
Change the X86 backend to stop using the evil ADDC/ADDE/SUBC/SUBE nodes (which
their carry depenedencies with MVT::Flag operands) and use clean and beautiful
EFLAGS dependences instead.
We do this by changing the modelling of SBB/ADC to have EFLAGS input and outputs
(which is what requires the previous scheduler change) and change X86 ISelLowering
to custom lower ADDC and friends down to X86ISD::ADD/ADC/SUB/SBB nodes.
With the previous series of changes, this causes no changes in the testsuite, woo.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122213 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/X86ISelLowering.h')
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/Target/X86/X86ISelLowering.h b/lib/Target/X86/X86ISelLowering.h index 7566f98..3b59ffa 100644 --- a/lib/Target/X86/X86ISelLowering.h +++ b/lib/Target/X86/X86ISelLowering.h @@ -86,8 +86,8 @@ namespace llvm { /// X86 bit-test instructions. BT, - /// X86 SetCC. Operand 0 is condition code, and operand 1 is the flag - /// operand produced by a CMP instruction. + /// X86 SetCC. Operand 0 is condition code, and operand 1 is the EFLAGS + /// operand, usually produced by a CMP instruction. SETCC, // Same as SETCC except it's materialized with a sbb and the value is all @@ -207,7 +207,7 @@ namespace llvm { PCMPGTB, PCMPGTW, PCMPGTD, PCMPGTQ, // ADD, SUB, SMUL, etc. - Arithmetic operations with FLAGS results. - ADD, SUB, SMUL, + ADD, SUB, ADC, SBB, SMUL, INC, DEC, OR, XOR, AND, UMUL, // LOW, HI, FLAGS = umul LHS, RHS |