71 lines
2.3 KiB
LLVM
71 lines
2.3 KiB
LLVM
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; RUN: llc %s -x86-early-ifcvt -pass-remarks='early-ifcvt' -pass-remarks-missed='early-ifcvt' -mcpu=k8 -o - 2>&1 | FileCheck %s
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target triple = "x86_64-none-none"
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; CHECK: remark: <unknown>:0:0: performing if-conversion on branch:
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; CHECK-SAME: the condition adds {{[0-9]+}} cycle{{s?}} to the critical path,
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; CHECK-SAME: and the short leg adds another {{[0-9]+}} cycles{{s?}},
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; CHECK-SAME: and the long leg adds another {{[0-9]+}} cycles{{s?}},
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; CHECK-SAME: each staying under the threshold of {{[0-9]+}} cycles{{s?}}.
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define i32 @mm1(i1 %pred, i32 %val) {
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entry:
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br i1 %pred, label %if.true, label %if.else
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if.true:
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%v1 = add i32 1, %val
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br label %if.else
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if.else:
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%res = phi i32 [ %val, %entry ], [ %v1, %if.true ]
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ret i32 %res
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}
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; CHECK: remark: <unknown>:0:0: did not if-convert branch:
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; CHECK-SAME: the condition would add {{[0-9]+}} cycles{{s?}} to the critical path,
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; CHECK-SAME: and the short leg would add another {{[0-9]+}} cycles{{s?}},
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; CHECK-SAME: and the long leg would add another {{[0-9]+}} cycles{{s?}} exceeding the limit of {{[0-9]+}} cycles{{s?}}.
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define i32 @mm2(i1 %pred, i32 %val, i32 %e1, i32 %e2, i32 %e3, i32 %e4, i32 %e5) {
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entry:
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br i1 %pred, label %if.true, label %if.else
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if.true:
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%v1 = add i32 %e1, %val
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%v2 = add i32 %e2, %v1
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%v3 = add i32 %e3, %v2
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%v4 = add i32 %e4, %v3
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br label %if.else
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if.else:
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%res = phi i32 [ %val, %entry ], [ %v4, %if.true ]
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ret i32 %res
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}
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; CHECK: did not if-convert branch:
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; CHECK-SAME: the resulting critical path ({{[0-9]+}} cycles{{s?}})
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; CHECK-SAME: would extend the shorter leg's critical path ({{[0-9]+}} cycle{{s?}})
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; CHECK-SAME: by more than the threshold of {{[0-9]+}} cycles{{s?}},
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; CHECK-SAME: which cannot be hidden by available ILP.
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define i32 @mm3(i1 %pred, i32 %val, i32 %e1, i128 %e2, i128 %e3, i128 %e4, i128 %e5) {
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entry:
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br i1 %pred, label %if.true, label %if.false
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if.true:
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br label %if.endif
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if.false:
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%f1 = mul i32 %e1, %e1
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%f3 = sext i32 %f1 to i128
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%f4 = mul i128 %e2, %f3
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%f6 = add i128 %e3, %f4
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%f7 = xor i128 %e4, %f6
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%f8 = xor i128 %e5, %f7
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%a1 = ashr i128 %f8, %e5
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%f5 = trunc i128 %a1 to i32
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br label %if.endif
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if.endif:
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%r1 = phi i32 [ %val, %if.true ], [ %f1, %if.false ]
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%r2 = phi i32 [ %val, %if.true ], [ %f5, %if.false ]
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%res = add i32 %r1, %r2
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ret i32 %res
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}
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