78 lines
2.9 KiB
LLVM
78 lines
2.9 KiB
LLVM
;RUN: opt -loop-unswitch -simplifycfg -S < %s | FileCheck %s
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define i32 @foo(i32 %a, i32 %b) {
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;CHECK-LABEL: foo
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entry:
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br label %for.body.lr.ph
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for.body.lr.ph: ; preds = %entry
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%cmp0 = icmp sgt i32 %b, 0
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br i1 %cmp0, label %for.body, label %for.cond.cleanup
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for.body: ; preds = %for.inc, %for.body.lr.ph
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%inc.i = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.inc ]
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%mul.i = phi i32 [ 3, %for.body.lr.ph ], [ %mul.p, %for.inc ]
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%add.i = phi i32 [ %a, %for.body.lr.ph ], [ %add.p, %for.inc ]
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%cmp1 = icmp eq i32 %a, 12345
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br i1 %cmp1, label %if.then, label %if.else, !prof !0
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; CHECK: %cmp1 = icmp eq i32 %a, 12345
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; CHECK-NEXT: br i1 %cmp1, label %for.body.us, label %for.body, !prof !0
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if.then: ; preds = %for.body
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; CHECK: for.body.us:
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; CHECK: add nsw i32 %{{.*}}, 123
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; CHECK: %exitcond.us = icmp eq i32 %inc.us, %b
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; CHECK: br i1 %exitcond.us, label %for.cond.cleanup, label %for.body.us
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%add = add nsw i32 %add.i, 123
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br label %for.inc
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if.else: ; preds = %for.body
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%mul = mul nsw i32 %mul.i, %b
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br label %for.inc
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; CHECK: for.body:
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; CHECK: %mul = mul nsw i32 %mul.i, %b
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; CHECK: %inc = add nuw nsw i32 %inc.i, 1
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; CHECK: %exitcond = icmp eq i32 %inc, %b
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; CHECK: br i1 %exitcond, label %for.cond.cleanup, label %for.body
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for.inc: ; preds = %if.then, %if.else
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%mul.p = phi i32 [ %b, %if.then ], [ %mul, %if.else ]
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%add.p = phi i32 [ %add, %if.then ], [ %a, %if.else ]
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%inc = add nuw nsw i32 %inc.i, 1
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%exitcond = icmp eq i32 %inc, %b
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br i1 %exitcond, label %for.cond.cleanup, label %for.body
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for.cond.cleanup: ; preds = %for.inc, %for.body.lr.ph
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%t2 = phi i32 [ %b, %for.body.lr.ph ], [ %mul.p, %for.inc ]
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%t1 = phi i32 [ %a, %for.body.lr.ph ], [ %add.p, %for.inc ]
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%add3 = add nsw i32 %t2, %t1
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ret i32 %add3
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}
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define void @foo_swapped(i32 %a, i32 %b) {
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;CHECK-LABEL: foo_swapped
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entry:
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br label %for.body
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;CHECK: entry:
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;CHECK-NEXT: %cmp1 = icmp eq i32 1, 2
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;CHECK-NEXT: br i1 %cmp1, label %for.body, label %for.cond.cleanup.split, !prof !1
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;CHECK: for.body:
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for.body: ; preds = %for.inc, %entry
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%inc.i = phi i32 [ 0, %entry ], [ %inc, %if.then ]
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%add.i = phi i32 [ 100, %entry ], [ %add, %if.then ]
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%inc = add nuw nsw i32 %inc.i, 1
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%cmp1 = icmp eq i32 1, 2
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br i1 %cmp1, label %if.then, label %for.cond.cleanup, !prof !0
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if.then: ; preds = %for.body
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%add = add nsw i32 %a, %add.i
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%exitcond = icmp eq i32 %inc, %b
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br i1 %exitcond, label %for.cond.cleanup, label %for.body
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for.cond.cleanup: ; preds = %for.inc, %for.body.lr.ph, %for.body
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ret void
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}
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!0 = !{!"branch_weights", i32 64, i32 4}
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;CHECK: !0 = !{!"branch_weights", i32 64, i32 4}
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;CHECK: !1 = !{!"branch_weights", i32 4, i32 64}
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