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e89c19ab7b
This is done by pushing physical register definitions close to their use, which happens to handle flag definitions if they're not glued to the branch. This seems to be generally a good thing though, so I didn't need to add a target hook yet. The primary motivation is to generate code closer to what people expect and rule out missed opportunity from enabling macro-op fusion. As a side benefit, we get several 2-5% gains on x86 benchmarks. There is one regression: SingleSource/Benchmarks/Shootout/lists slows down be -10%. But this is an independent scheduler bug that will be tracked separately. See rdar://problem/9283108. Incidentally, pre-RA scheduling is only half the solution. Fixing the later passes is tracked by: <rdar://problem/8932804> [pre-RA-sched] on x86, attempt to schedule CMP/TEST adjacent with condition jump Fixes: <rdar://problem/9262453> Scheduler unnecessary break of cmp/jump fusion llvm-svn: 129508
66 lines
3.2 KiB
LLVM
66 lines
3.2 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=yonah | FileCheck %s
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; Reduced from JavaScriptCore
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%"class.JSC::CodeLocationCall" = type { [8 x i8] }
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%"class.JSC::JSGlobalData" = type { [4 x i8] }
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%"class.JSC::FunctionPtr" = type { i8* }
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%"class.JSC::Structure" = type { [4 x i8] }
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%"class.JSC::UString" = type { i8* }
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%"class.JSC::JSString" = type { [16 x i8], i32, %"class.JSC::UString", i32 }
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declare hidden fastcc void @_ZN3JSCL23returnToThrowTrampolineEPNS_12JSGlobalDataENS_16ReturnAddressPtrERS2_(%"class.JSC::JSGlobalData"* nocapture, i8*, %"class.JSC::FunctionPtr"* nocapture) nounwind noinline ssp
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; Avoid hoisting the test above loads or copies
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; CHECK: %entry
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; CHECK: cmpq
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; CHECK-NOT: mov
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; CHECK: jb
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define i32 @cti_op_eq(i8** nocapture %args) nounwind ssp {
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entry:
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%0 = load i8** null, align 8
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%tmp13 = bitcast i8* %0 to %"class.JSC::CodeLocationCall"*
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%tobool.i.i.i = icmp ugt i8* undef, inttoptr (i64 281474976710655 to i8*)
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%or.cond.i = and i1 %tobool.i.i.i, undef
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br i1 %or.cond.i, label %if.then.i, label %if.end.i
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if.then.i: ; preds = %entry
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br i1 undef, label %if.then.i.i.i, label %_ZN3JSC7JSValue19equalSlowCaseInlineEPNS_9ExecStateES0_S0_.exit
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if.then.i.i.i: ; preds = %if.then.i
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%conv.i.i.i.i = trunc i64 undef to i32
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br label %_ZN3JSC7JSValue19equalSlowCaseInlineEPNS_9ExecStateES0_S0_.exit
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if.end.i: ; preds = %entry
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br i1 undef, label %land.rhs.i121.i, label %_ZNK3JSC7JSValue8isStringEv.exit122.i
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land.rhs.i121.i: ; preds = %if.end.i
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%tmp.i.i117.i = load %"class.JSC::Structure"** undef, align 8
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br label %_ZNK3JSC7JSValue8isStringEv.exit122.i
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_ZNK3JSC7JSValue8isStringEv.exit122.i: ; preds = %land.rhs.i121.i, %if.end.i
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%brmerge.i = or i1 undef, false
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%or.cond = or i1 false, %brmerge.i
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br i1 %or.cond, label %_ZN3JSC7JSValue19equalSlowCaseInlineEPNS_9ExecStateES0_S0_.exit, label %if.then.i92.i
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if.then.i92.i: ; preds = %_ZNK3JSC7JSValue8isStringEv.exit122.i
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tail call void @_ZNK3JSC8JSString11resolveRopeEPNS_9ExecStateE(%"class.JSC::JSString"* undef, %"class.JSC::CodeLocationCall"* %tmp13) nounwind
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unreachable
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_ZN3JSC7JSValue19equalSlowCaseInlineEPNS_9ExecStateES0_S0_.exit: ; preds = %_ZNK3JSC7JSValue8isStringEv.exit122.i, %if.then.i.i.i, %if.then.i
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%1 = load i8** undef, align 8
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br i1 undef, label %do.end39, label %do.body27
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do.body27: ; preds = %_ZN3JSC7JSValue19equalSlowCaseInlineEPNS_9ExecStateES0_S0_.exit
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%tmp30 = bitcast i8* %1 to %"class.JSC::JSGlobalData"*
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%2 = getelementptr inbounds i8** %args, i64 -1
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%3 = bitcast i8** %2 to %"class.JSC::FunctionPtr"*
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tail call fastcc void @_ZN3JSCL23returnToThrowTrampolineEPNS_12JSGlobalDataENS_16ReturnAddressPtrERS2_(%"class.JSC::JSGlobalData"* %tmp30, i8* undef, %"class.JSC::FunctionPtr"* %3)
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unreachable
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do.end39: ; preds = %_ZN3JSC7JSValue19equalSlowCaseInlineEPNS_9ExecStateES0_S0_.exit
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ret i32 undef
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}
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declare void @_ZNK3JSC8JSString11resolveRopeEPNS_9ExecStateE(%"class.JSC::JSString"*, %"class.JSC::CodeLocationCall"*)
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