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60 lines
2.3 KiB
LLVM
60 lines
2.3 KiB
LLVM
; RUN: opt < %s -analyze -branch-prob | FileCheck %s
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; RUN: opt < %s -passes='print<branch-prob>' -disable-output 2>&1 | FileCheck %s
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; Since neither of while.body's out-edges is an exit or a back edge,
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; calcLoopBranchHeuristics should return early without setting the weights.
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; calcFloatingPointHeuristics, which is run later, sets the weights.
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;
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; CHECK: edge while.body -> if.then probability is 0x50000000 / 0x80000000 = 62.50%
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; CHECK: edge while.body -> if.else probability is 0x30000000 / 0x80000000 = 37.50%
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define void @foo1(i32 %n, i32* nocapture %b, i32* nocapture %c, i32* nocapture %d, float* nocapture readonly %f0, float* nocapture readonly %f1) {
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entry:
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%tobool8 = icmp eq i32 %n, 0
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br i1 %tobool8, label %while.end, label %while.body.lr.ph
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while.body.lr.ph:
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%0 = sext i32 %n to i64
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br label %while.body
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while.body:
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%indvars.iv = phi i64 [ %0, %while.body.lr.ph ], [ %indvars.iv.next, %if.end ]
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%b.addr.011 = phi i32* [ %b, %while.body.lr.ph ], [ %b.addr.1, %if.end ]
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%d.addr.010 = phi i32* [ %d, %while.body.lr.ph ], [ %incdec.ptr4, %if.end ]
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%c.addr.09 = phi i32* [ %c, %while.body.lr.ph ], [ %c.addr.1, %if.end ]
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%indvars.iv.next = add nsw i64 %indvars.iv, -1
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%arrayidx = getelementptr inbounds float, float* %f0, i64 %indvars.iv.next
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%1 = load float, float* %arrayidx, align 4
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%arrayidx2 = getelementptr inbounds float, float* %f1, i64 %indvars.iv.next
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%2 = load float, float* %arrayidx2, align 4
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%cmp = fcmp une float %1, %2
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br i1 %cmp, label %if.then, label %if.else
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if.then:
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%incdec.ptr = getelementptr inbounds i32, i32* %b.addr.011, i64 1
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%3 = load i32, i32* %b.addr.011, align 4
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%add = add nsw i32 %3, 12
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store i32 %add, i32* %b.addr.011, align 4
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br label %if.end
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if.else:
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%incdec.ptr3 = getelementptr inbounds i32, i32* %c.addr.09, i64 1
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%4 = load i32, i32* %c.addr.09, align 4
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%sub = add nsw i32 %4, -13
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store i32 %sub, i32* %c.addr.09, align 4
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br label %if.end
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if.end:
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%c.addr.1 = phi i32* [ %c.addr.09, %if.then ], [ %incdec.ptr3, %if.else ]
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%b.addr.1 = phi i32* [ %incdec.ptr, %if.then ], [ %b.addr.011, %if.else ]
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%incdec.ptr4 = getelementptr inbounds i32, i32* %d.addr.010, i64 1
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store i32 14, i32* %d.addr.010, align 4
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%5 = trunc i64 %indvars.iv.next to i32
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%tobool = icmp eq i32 %5, 0
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br i1 %tobool, label %while.end, label %while.body
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while.end:
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ret void
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}
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