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clang-p2996/llvm/test/Transforms/SimplifyCFG/convergent.ll
Jay Foad 31ec0a6845 [SimplifyCFG] Improve the way hoisting skips over non-matching instructions 
D129370 introduced the idea that hoisting could skip over non-matching
instructions and continue to look for matching (hoistable) instructions,
but certain types of mismatch still aborted the whole hoisting attempt.

Fix this by splitting out some of the instruction matching checks into a
helper function.

Also forbid hoisting allocas past stacksave/stackrestore, completing the
fix started in D133730, to avoid regressing tests.

Differential Revision: https://reviews.llvm.org/D149365
2023-04-28 10:03:32 +01:00

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5.6 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 < %s | FileCheck -check-prefixes=CHECK,NOSINK %s
; RUN: opt -S -passes=simplifycfg < %s | FileCheck -check-prefixes=CHECK,NOSINK %s
; RUN: opt -S -passes='simplifycfg<hoist-common-insts;sink-common-insts>' < %s | FileCheck -check-prefixes=CHECK,SINK %s
declare void @foo() convergent
declare i32 @tid()
declare i32 @mbcnt(i32 %a, i32 %b) convergent
declare i32 @bpermute(i32 %a, i32 %b) convergent
define i32 @test_01(i32 %a) {
; CHECK-LABEL: @test_01(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[A:%.*]], 0
; CHECK-NEXT: br i1 [[COND]], label [[MERGE:%.*]], label [[IF_FALSE:%.*]]
; CHECK: if.false:
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: br label [[MERGE]]
; CHECK: merge:
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: br i1 [[COND]], label [[EXIT:%.*]], label [[IF_FALSE_2:%.*]]
; CHECK: if.false.2:
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret i32 [[A]]
;
entry:
%cond = icmp eq i32 %a, 0
br i1 %cond, label %merge, label %if.false
if.false:
call void @foo()
br label %merge
merge:
call void @foo()
br i1 %cond, label %exit, label %if.false.2
if.false.2:
call void @foo()
br label %exit
exit:
ret i32 %a
}
define void @test_02(ptr %y.coerce) convergent {
; NOSINK-LABEL: @test_02(
; NOSINK-NEXT: entry:
; NOSINK-NEXT: [[TMP0:%.*]] = tail call i32 @tid()
; NOSINK-NEXT: [[REM:%.*]] = and i32 [[TMP0]], 1
; NOSINK-NEXT: [[CMP_NOT:%.*]] = icmp eq i32 [[REM]], 0
; NOSINK-NEXT: br i1 [[CMP_NOT]], label [[IF_ELSE:%.*]], label [[IF_THEN:%.*]]
; NOSINK: if.then:
; NOSINK-NEXT: [[TMP1:%.*]] = tail call i32 @mbcnt(i32 -1, i32 0)
; NOSINK-NEXT: [[TMP2:%.*]] = tail call i32 @mbcnt(i32 -1, i32 [[TMP1]])
; NOSINK-NEXT: [[AND_I:%.*]] = shl i32 [[TMP2]], 2
; NOSINK-NEXT: [[ADD_I:%.*]] = and i32 [[AND_I]], -256
; NOSINK-NEXT: [[SHL_I:%.*]] = or i32 [[ADD_I]], 16
; NOSINK-NEXT: [[TMP3:%.*]] = tail call i32 @bpermute(i32 [[SHL_I]], i32 [[TMP0]])
; NOSINK-NEXT: [[IDXPROM:%.*]] = zext i32 [[TMP0]] to i64
; NOSINK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i32, ptr [[Y_COERCE:%.*]], i64 [[IDXPROM]]
; NOSINK-NEXT: store i32 [[TMP3]], ptr [[ARRAYIDX]], align 4
; NOSINK-NEXT: br label [[IF_END:%.*]]
; NOSINK: if.else:
; NOSINK-NEXT: [[TMP4:%.*]] = tail call i32 @mbcnt(i32 -1, i32 0)
; NOSINK-NEXT: [[TMP5:%.*]] = tail call i32 @mbcnt(i32 -1, i32 [[TMP4]])
; NOSINK-NEXT: [[AND_I11:%.*]] = shl i32 [[TMP5]], 2
; NOSINK-NEXT: [[ADD_I12:%.*]] = and i32 [[AND_I11]], -256
; NOSINK-NEXT: [[SHL_I13:%.*]] = or i32 [[ADD_I12]], 8
; NOSINK-NEXT: [[TMP6:%.*]] = tail call i32 @bpermute(i32 [[SHL_I13]], i32 [[TMP0]])
; NOSINK-NEXT: [[IDXPROM4:%.*]] = zext i32 [[TMP0]] to i64
; NOSINK-NEXT: [[ARRAYIDX5:%.*]] = getelementptr inbounds i32, ptr [[Y_COERCE]], i64 [[IDXPROM4]]
; NOSINK-NEXT: store i32 [[TMP6]], ptr [[ARRAYIDX5]], align 4
; NOSINK-NEXT: br label [[IF_END]]
; NOSINK: if.end:
; NOSINK-NEXT: ret void
;
; SINK-LABEL: @test_02(
; SINK-NEXT: entry:
; SINK-NEXT: [[TMP0:%.*]] = tail call i32 @tid()
; SINK-NEXT: [[REM:%.*]] = and i32 [[TMP0]], 1
; SINK-NEXT: [[CMP_NOT:%.*]] = icmp eq i32 [[REM]], 0
; SINK-NEXT: [[IDXPROM4:%.*]] = zext i32 [[TMP0]] to i64
; SINK-NEXT: [[ARRAYIDX5:%.*]] = getelementptr inbounds i32, ptr [[Y_COERCE:%.*]], i64 [[IDXPROM4]]
; SINK-NEXT: br i1 [[CMP_NOT]], label [[IF_ELSE:%.*]], label [[IF_THEN:%.*]]
; SINK: if.then:
; SINK-NEXT: [[TMP1:%.*]] = tail call i32 @mbcnt(i32 -1, i32 0)
; SINK-NEXT: [[TMP2:%.*]] = tail call i32 @mbcnt(i32 -1, i32 [[TMP1]])
; SINK-NEXT: [[AND_I:%.*]] = shl i32 [[TMP2]], 2
; SINK-NEXT: [[ADD_I:%.*]] = and i32 [[AND_I]], -256
; SINK-NEXT: [[SHL_I:%.*]] = or i32 [[ADD_I]], 16
; SINK-NEXT: [[TMP3:%.*]] = tail call i32 @bpermute(i32 [[SHL_I]], i32 [[TMP0]])
; SINK-NEXT: br label [[IF_END:%.*]]
; SINK: if.else:
; SINK-NEXT: [[TMP4:%.*]] = tail call i32 @mbcnt(i32 -1, i32 0)
; SINK-NEXT: [[TMP5:%.*]] = tail call i32 @mbcnt(i32 -1, i32 [[TMP4]])
; SINK-NEXT: [[AND_I11:%.*]] = shl i32 [[TMP5]], 2
; SINK-NEXT: [[ADD_I12:%.*]] = and i32 [[AND_I11]], -256
; SINK-NEXT: [[SHL_I13:%.*]] = or i32 [[ADD_I12]], 8
; SINK-NEXT: [[TMP6:%.*]] = tail call i32 @bpermute(i32 [[SHL_I13]], i32 [[TMP0]])
; SINK-NEXT: br label [[IF_END]]
; SINK: if.end:
; SINK-NEXT: [[DOTSINK:%.*]] = phi i32 [ [[TMP6]], [[IF_ELSE]] ], [ [[TMP3]], [[IF_THEN]] ]
; SINK-NEXT: store i32 [[DOTSINK]], ptr [[ARRAYIDX5]], align 4
; SINK-NEXT: ret void
;
entry:
%0 = tail call i32 @tid()
%rem = and i32 %0, 1
%cmp.not = icmp eq i32 %rem, 0
br i1 %cmp.not, label %if.else, label %if.then
if.then:
%1 = tail call i32 @mbcnt(i32 -1, i32 0)
%2 = tail call i32 @mbcnt(i32 -1, i32 %1)
%and.i = shl i32 %2, 2
%add.i = and i32 %and.i, -256
%shl.i = or i32 %add.i, 16
%3 = tail call i32 @bpermute(i32 %shl.i, i32 %0)
%idxprom = zext i32 %0 to i64
%arrayidx = getelementptr inbounds i32, ptr %y.coerce, i64 %idxprom
store i32 %3, ptr %arrayidx
br label %if.end
if.else:
%4 = tail call i32 @mbcnt(i32 -1, i32 0)
%5 = tail call i32 @mbcnt(i32 -1, i32 %4)
%and.i11 = shl i32 %5, 2
%add.i12 = and i32 %and.i11, -256
%shl.i13 = or i32 %add.i12, 8
%6 = tail call i32 @bpermute(i32 %shl.i13, i32 %0)
%idxprom4 = zext i32 %0 to i64
%arrayidx5 = getelementptr inbounds i32, ptr %y.coerce, i64 %idxprom4
store i32 %6, ptr %arrayidx5
br label %if.end
if.end:
ret void
}
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