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[X86][X87] Tag FTST x87 instruction scheduler class 

Looking through Agner, FTST is very similar to generic float compare behaviour, so I've added them to the existing IIC_FCOMI (WriteFAdd) tags.

llvm-svn: 319184
This commit is contained in:
Simon Pilgrim 2017-11-28 16:57:20 +00:00
parent 1bfcba8cea
commit ece5bc358a
2 changed files with 9 additions and 8 deletions
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3
llvm/lib/Target/X86/X86InstrFPStack.td
View File

@ -327,7 +327,8 @@ def TST_Fp64 : FpIf64<(outs), (ins RFP64:$src), OneArgFP, []>;
def TST_Fp80 : FpI_<(outs), (ins RFP80:$src), OneArgFP, []>;
} // hasSideEffects
def TST_F : FPI<0xD9, MRM_E4, (outs), (ins), "ftst">;
let SchedRW = [WriteFAdd] in
def TST_F : FPI<0xD9, MRM_E4, (outs), (ins), "ftst", IIC_FCOMI>;
} // Defs = [FPSW]
// Versions of FP instructions that take a single memory operand. Added for the

14
llvm/test/CodeGen/X86/x87-schedule.ll
View File

@ -3778,21 +3778,21 @@ define void @test_ftst() optsize {
; ATOM-LABEL: test_ftst:
; ATOM: # BB#0:
; ATOM-NEXT: #APP
; ATOM-NEXT: ftst
; ATOM-NEXT: ftst # sched: [9:4.50]
; ATOM-NEXT: #NO_APP
; ATOM-NEXT: retl # sched: [79:39.50]
;
; SLM-LABEL: test_ftst:
; SLM: # BB#0:
; SLM-NEXT: #APP
; SLM-NEXT: ftst
; SLM-NEXT: ftst # sched: [3:1.00]
; SLM-NEXT: #NO_APP
; SLM-NEXT: retl # sched: [4:1.00]
;
; SANDY-LABEL: test_ftst:
; SANDY: # BB#0:
; SANDY-NEXT: #APP
; SANDY-NEXT: ftst
; SANDY-NEXT: ftst # sched: [3:1.00]
; SANDY-NEXT: #NO_APP
; SANDY-NEXT: retl # sched: [5:1.00]
;
@ -3806,28 +3806,28 @@ define void @test_ftst() optsize {
; BROADWELL-LABEL: test_ftst:
; BROADWELL: # BB#0:
; BROADWELL-NEXT: #APP
; BROADWELL-NEXT: ftst
; BROADWELL-NEXT: ftst # sched: [3:1.00]
; BROADWELL-NEXT: #NO_APP
; BROADWELL-NEXT: retl # sched: [6:0.50]
;
; SKYLAKE-LABEL: test_ftst:
; SKYLAKE: # BB#0:
; SKYLAKE-NEXT: #APP
; SKYLAKE-NEXT: ftst
; SKYLAKE-NEXT: ftst # sched: [3:1.00]
; SKYLAKE-NEXT: #NO_APP
; SKYLAKE-NEXT: retl # sched: [6:0.50]
;
; SKX-LABEL: test_ftst:
; SKX: # BB#0:
; SKX-NEXT: #APP
; SKX-NEXT: ftst
; SKX-NEXT: ftst # sched: [3:1.00]
; SKX-NEXT: #NO_APP
; SKX-NEXT: retl # sched: [6:0.50]
;
; BTVER2-LABEL: test_ftst:
; BTVER2: # BB#0:
; BTVER2-NEXT: #APP
; BTVER2-NEXT: ftst
; BTVER2-NEXT: ftst # sched: [3:1.00]
; BTVER2-NEXT: #NO_APP
; BTVER2-NEXT: retl # sched: [4:1.00]
;