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79846e5c9b
Implement the TII hooks needed by EarlyIfConversion to create cmov instructions and estimate their latency. Early if-conversion is still not enabled by default. llvm-svn: 159695
40 lines
1.2 KiB
LLVM
40 lines
1.2 KiB
LLVM
; RUN: llc < %s -enable-early-ifcvt -stress-early-ifcvt | FileCheck %s
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target triple = "x86_64-apple-macosx10.8.0"
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; CHECK: mm2
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define i32 @mm2(i32* nocapture %p, i32 %n) nounwind uwtable readonly ssp {
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entry:
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br label %do.body
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; CHECK: do.body
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; Loop body has no branches before the backedge.
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; CHECK-NOT: LBB
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do.body:
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%max.0 = phi i32 [ 0, %entry ], [ %max.1, %do.cond ]
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%min.0 = phi i32 [ 0, %entry ], [ %min.1, %do.cond ]
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%n.addr.0 = phi i32 [ %n, %entry ], [ %dec, %do.cond ]
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%p.addr.0 = phi i32* [ %p, %entry ], [ %incdec.ptr, %do.cond ]
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%incdec.ptr = getelementptr inbounds i32* %p.addr.0, i64 1
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%0 = load i32* %p.addr.0, align 4
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%cmp = icmp sgt i32 %0, %max.0
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br i1 %cmp, label %do.cond, label %if.else
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if.else:
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%cmp1 = icmp slt i32 %0, %min.0
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%.min.0 = select i1 %cmp1, i32 %0, i32 %min.0
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br label %do.cond
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do.cond:
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%max.1 = phi i32 [ %0, %do.body ], [ %max.0, %if.else ]
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%min.1 = phi i32 [ %min.0, %do.body ], [ %.min.0, %if.else ]
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; CHECK: decl %esi
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; CHECK: jne LBB
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%dec = add i32 %n.addr.0, -1
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%tobool = icmp eq i32 %dec, 0
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br i1 %tobool, label %do.end, label %do.body
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do.end:
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%sub = sub nsw i32 %max.1, %min.1
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ret i32 %sub
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}
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