From 026d3abbb22d4ac067a57d0a9aa2b2482266c9e7 Mon Sep 17 00:00:00 2001 From: Paul Brook Date: Wed, 18 Apr 2007 13:49:34 +0000 Subject: 2007-04-18 Paul Brook gas/testsuite/ * gas/arm/thumb2_add.s: Add rsb #0 test. * gas/arm/thumb2_add.d: Update expected output. gas/ * config/tc-arm.c (do_t_rsb): Use 16-bit encoding when possible. --- gas/config/tc-arm.c | 33 +++++++++++++++++++++++++++++++-- 1 file changed, 31 insertions(+), 2 deletions(-) (limited to 'gas/config') diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c index 9b8db7a..b20803f 100644 --- a/gas/config/tc-arm.c +++ b/gas/config/tc-arm.c @@ -9956,8 +9956,37 @@ do_t_rsb (void) inst.instruction |= Rs << 16; if (!inst.operands[2].isreg) { - inst.instruction = (inst.instruction & 0xe1ffffff) | 0x10000000; - inst.reloc.type = BFD_RELOC_ARM_T32_IMMEDIATE; + bfd_boolean narrow; + + if ((inst.instruction & 0x00100000) != 0) + narrow = (current_it_mask == 0); + else + narrow = (current_it_mask != 0); + + if (Rd > 7 || Rs > 7) + narrow = FALSE; + + if (inst.size_req == 4 || !unified_syntax) + narrow = FALSE; + + if (inst.reloc.exp.X_op != O_constant + || inst.reloc.exp.X_add_number != 0) + narrow = FALSE; + + /* Turn rsb #0 into 16-bit neg. We should probably do this via + relaxation, but it doesn't seem worth the hassle. */ + if (narrow) + { + inst.reloc.type = BFD_RELOC_UNUSED; + inst.instruction = THUMB_OP16 (T_MNEM_negs); + inst.instruction |= Rs << 3; + inst.instruction |= Rd; + } + else + { + inst.instruction = (inst.instruction & 0xe1ffffff) | 0x10000000; + inst.reloc.type = BFD_RELOC_ARM_T32_IMMEDIATE; + } } else encode_thumb32_shifted_operand (2); -- cgit v1.1