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| author | Mihai Popa <mihail.popa@gmail.com> | 2013-08-16 11:55:44 +0000 |
|---|---|---|
| committer | Mihai Popa <mihail.popa@gmail.com> | 2013-08-16 11:55:44 +0000 |
| commit | 8b36f9e4314ac4d786d2d4fd5fa9e7858487ee9e (patch) | |
| tree | 7145203da7f1e3fc643f0c3048fa86a2293a1b8f /lib/Target/ARM/ARMInstrThumb2.td | |
| parent | 19262ee0725a09b7c621a3d2eb66ba1513ae932a (diff) | |
| download | external_llvm-8b36f9e4314ac4d786d2d4fd5fa9e7858487ee9e.zip external_llvm-8b36f9e4314ac4d786d2d4fd5fa9e7858487ee9e.tar.gz external_llvm-8b36f9e4314ac4d786d2d4fd5fa9e7858487ee9e.tar.bz2 | |
Fix Thumb2 aliasing complementary instructions taking modified immediates
There are many Thumb instructions which take 12-bit immediates encoded in a special
8-byte value + 4-byte rotator form. Not all numbers are represented, and it's legal
to transform an assembly instruction to be able to encode the immediate.
For example: AND and BIC are complementary instructions; one can switch the AND
to a BIC as long as the immediate is complemented.
The intent is to switch one instruction into its complementary one when the immediate
cannot be encoded in the form requested in the original assembly and when the
complementary immediate is encodable.
The patch addresses two issues:
1. definition of t2SOImmNot immediate - it has to check that the orignal value is
not encoded naturally
2. t2AND and t2BIC instruction aliases which should use the Thumb2 SOImm operand
rather than the ARM one.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188548 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/ARM/ARMInstrThumb2.td')
| -rw-r--r-- | lib/Target/ARM/ARMInstrThumb2.td | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/lib/Target/ARM/ARMInstrThumb2.td b/lib/Target/ARM/ARMInstrThumb2.td index 77a3759..376246b 100644 --- a/lib/Target/ARM/ARMInstrThumb2.td +++ b/lib/Target/ARM/ARMInstrThumb2.td @@ -4353,16 +4353,16 @@ def : t2InstAlias<"mvn${p} $Rd, $imm", (t2MOVi rGPR:$Rd, t2_so_imm_not:$imm, pred:$p, zero_reg)>; // Same for AND <--> BIC def : t2InstAlias<"bic${s}${p} $Rd, $Rn, $imm", - (t2ANDri rGPR:$Rd, rGPR:$Rn, so_imm_not:$imm, + (t2ANDri rGPR:$Rd, rGPR:$Rn, t2_so_imm_not:$imm, pred:$p, cc_out:$s)>; def : t2InstAlias<"bic${s}${p} $Rdn, $imm", - (t2ANDri rGPR:$Rdn, rGPR:$Rdn, so_imm_not:$imm, + (t2ANDri rGPR:$Rdn, rGPR:$Rdn, t2_so_imm_not:$imm, pred:$p, cc_out:$s)>; def : t2InstAlias<"and${s}${p} $Rd, $Rn, $imm", - (t2BICri rGPR:$Rd, rGPR:$Rn, so_imm_not:$imm, + (t2BICri rGPR:$Rd, rGPR:$Rn, t2_so_imm_not:$imm, pred:$p, cc_out:$s)>; def : t2InstAlias<"and${s}${p} $Rdn, $imm", - (t2BICri rGPR:$Rdn, rGPR:$Rdn, so_imm_not:$imm, + (t2BICri rGPR:$Rdn, rGPR:$Rdn, t2_so_imm_not:$imm, pred:$p, cc_out:$s)>; // Likewise, "add Rd, t2_so_imm_neg" -> sub def : t2InstAlias<"add${s}${p} $Rd, $Rn, $imm", |