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[mips][microMIPS] Fix an issue with selecting sqrt instruction in LLVM backend 

Summary:
This fixes 7 tests during fast LLVM test-suite run:
* MultiSource/Benchmarks/McCat/18-imp/imp
* MultiSource/Applications/oggenc/oggenc
* MultiSource/Benchmarks/MallocBench/gs/gs
* MultiSource/Benchmarks/MiBench/automotive-susan/automotive-susan
* MultiSource/Benchmarks/VersaBench/beamformer/beamformer
* MultiSource/Benchmarks/MiBench/consumer-lame/consumer-lame
* MultiSource/Benchmarks/Bullet/bullet

Error message was in the form of:
fatal error: error in backend: Cannot select: 0x95c3288: f32 = fsqrt 0x95c0190 [ORD=9] [ID=18]
  0x95c0190: f32 = fadd 0x95bef30, 0x95c4d00 [ORD=8] [ID=17]
    0x95bef30: f32 = fmul 0x95c4988, 0x95c4988 [ORD=5] [ID=16]
...

There was problem with selecting sqrt instruction in LLVM backend.

To fix the issue changes are made in TableGen definition for sqrt instruction in MipsInstrFPU.td and new test file sqrt.ll is added to LLVM regression tests.

Patch by Zlatko Buljan

Reviewers: zoran.jovanovic, hvarga, dsanders

Subscribers: llvm-commits, petarj

Differential Revision: http://reviews.llvm.org/D13235

llvm-svn: 249416
This commit is contained in:
Daniel Sanders 2015-10-06 15:17:25 +00:00
parent add9057fa7
commit 1b3341724c
2 changed files with 15 additions and 5 deletions
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7
llvm/lib/Target/Mips/MipsInstrFPU.td
View File

@ -353,11 +353,8 @@ def FNEG_S : MMRel, ABSS_FT<"neg.s", FGR32Opnd, FGR32Opnd, II_NEG, fneg>,
defm FABS : ABSS_M<"abs.d", II_ABS, fabs>, ABSS_FM<0x5, 17>;
defm FNEG : ABSS_M<"neg.d", II_NEG, fneg>, ABSS_FM<0x7, 17>;
let AdditionalPredicates = [NotInMicroMips] in {
def FSQRT_S : MMRel, ABSS_FT<"sqrt.s", FGR32Opnd, FGR32Opnd, II_SQRT_S, fsqrt>,
ABSS_FM<0x4, 16>, ISA_MIPS2;
}
def FSQRT_S : MMRel, StdMMR6Rel, ABSS_FT<"sqrt.s", FGR32Opnd, FGR32Opnd,
II_SQRT_S, fsqrt>, ABSS_FM<0x4, 16>, ISA_MIPS2;
defm FSQRT : ABSS_M<"sqrt.d", II_SQRT_D, fsqrt>, ABSS_FM<0x4, 17>, ISA_MIPS2;
// The odd-numbered registers are only referenced when doing loads,

13
llvm/test/CodeGen/Mips/llvm-ir/sqrt.ll Normal file
View File

@ -0,0 +1,13 @@
; RUN: llc < %s -march=mipsel -mcpu=mips32r2 -mattr=+micromips | FileCheck %s
; RUN: llc < %s -march=mips -mcpu=mips32r2 -mattr=+micromips | FileCheck %s
; RUN: llc < %s -march=mips -mcpu=mips32r6 -mattr=+micromips | FileCheck %s
define float @sqrt_fn(float %value) #0 {
entry:
%sqrtf = tail call float @sqrtf(float %value) #0
ret float %sqrtf
}
declare float @sqrtf(float)
; CHECK: sqrt.s $f0, $f12