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[ARM] Don't be overzealous converting Thumb1 3 to 2 operands

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Differential Revision: http://reviews.llvm.org/D11056

llvm-svn: 241801
This commit is contained in:
Scott Douglass 2015-07-09 14:13:48 +00:00
parent 82d04ef2eb
commit 480340a7cb
2 changed files with 17 additions and 0 deletions
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5
lib/Target/ARM/AsmParser/ARMAsmParser.cpp
View File

@ -5512,6 +5512,11 @@ void ARMAsmParser::tryConvertingToTwoOperandForm(StringRef Mnemonic,
if (((Mnemonic == "add" && CarrySetting) || Mnemonic == "sub") &&
Op5.isReg())
Transform = false;
// Don't transform 'add/sub{s} Rd, Rd, #imm' if the immediate fits into
// 3-bits because the ARMARM says not to.
if ((Mnemonic == "add" || Mnemonic == "sub") && Op5.isImm0_7())
Transform = false;
}
if (Transform)

12
test/MC/ARM/thumb_rewrites.s
View File

@ -1,5 +1,11 @@
@ RUN: llvm-mc -triple thumbv6m -show-encoding < %s | FileCheck %s
adds r1, r1, #3
@ CHECK: adds r1, r1, #3 @ encoding: [0xc9,0x1c]
adds r1, #3
@ CHECK: adds r1, #3 @ encoding: [0x03,0x31]
adds r0, r0, #8
@ CHECK: adds r0, #8 @ encoding: [0x08,0x30]
@ -34,6 +40,12 @@
subs r0, r0, r0
@ CHECK: subs r0, r0, r0 @ encoding: [0x00,0x1a]
subs r3, r3, #5
@ CHECK: subs r3, r3, #5 @ encoding: [0x5b,0x1f]
subs r3, #5
@ CHECK: subs r3, #5 @ encoding: [0x05,0x3b]
subs r2, r2, #8
@ CHECK: subs r2, #8 @ encoding: [0x08,0x3a]