d7378259aa
This function is called when some predecessor of an empty return block ends with a conditional branch, with both successors being empty ret blocks. Now, because of the way SimplifyCFG works, it might happen to simplify one of the blocks in a way that makes a conditional branch into an unconditional one, since it's destinations are now identical, but it might not have actually simplified said conditional branch into an unconditional one yet. So, we have to check that ourselves first, especially now that SimplifyCFG aggressively tail-merges all ret and resume blocks. Even if it was an unconditional branch already, `SimplifyCFGOpt::simplifyReturn()` doesn't call `FoldReturnIntoUncondBranch()` by default.
69 lines
1.3 KiB
LLVM
69 lines
1.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
|
|
; RUN: opt < %s -S -indvars -loop-deletion -simplifycfg -simplifycfg-require-and-preserve-domtree=1 | FileCheck %s
|
|
; PR5794
|
|
|
|
; Indvars and loop deletion should be able to eliminate all looping
|
|
; in this testcase.
|
|
|
|
target datalayout = "e-p:64:64:64"
|
|
|
|
define i32 @pmat(i32 %m, i32 %n, double* %y) nounwind {
|
|
; CHECK-LABEL: @pmat(
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: [[CMP4:%.*]] = icmp sgt i32 [[M:%.*]], 0
|
|
; CHECK-NEXT: ret i32 0
|
|
;
|
|
entry:
|
|
%cmp4 = icmp sgt i32 %m, 0
|
|
br i1 %cmp4, label %bb.n10, label %w.e12
|
|
|
|
w.c:
|
|
%cmp = icmp slt i32 %inc11, %m
|
|
br i1 %cmp, label %w.c2.p, label %w.c.w.e12c
|
|
|
|
w.c.w.e12c:
|
|
br label %w.c.w.e12c.s
|
|
|
|
w.c.w.e12c.s:
|
|
br label %w.e12
|
|
|
|
bb.n10:
|
|
%cmp51 = icmp sgt i32 %n, 0
|
|
br i1 %cmp51, label %bb.n10.w.c.w.e12c.sc, label %bb.n10.bb.n10.sc
|
|
|
|
bb.n10.bb.n10.sc:
|
|
br label %bb.n10.s
|
|
|
|
bb.n10.w.c.w.e12c.sc:
|
|
br label %w.c.w.e12c.s
|
|
|
|
bb.n10.s:
|
|
br label %w.c2.p
|
|
|
|
w.c2.p:
|
|
%i.05 = phi i32 [ 0, %bb.n10.s ], [ %inc11, %w.c ]
|
|
br i1 false, label %bb.n, label %w.e
|
|
|
|
w.c2:
|
|
br i1 undef, label %w.b6, label %w.c2.w.ec
|
|
|
|
w.c2.w.ec:
|
|
br label %w.e
|
|
|
|
bb.n:
|
|
br label %w.b6
|
|
|
|
w.b6:
|
|
br label %w.c2
|
|
|
|
w.e:
|
|
%i.08 = phi i32 [ undef, %w.c2.w.ec ], [ %i.05, %w.c2.p ]
|
|
%inc11 = add nsw i32 %i.08, 1
|
|
br label %w.c
|
|
|
|
w.e12:
|
|
ret i32 0
|
|
}
|
|
|
|
; CHECK: attributes #0 = { nounwind }
|