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[CVP] Add additional switch tests (NFC) 

These cover cases handled by getPredicateAt(), but not by the
current implementation:

 * Assumes based on context instruction.
 * Value from phi node in same block (using per-pred reasoning).
 * Value from non-phi node in same block (using block-val reasoning).
This commit is contained in:
Nikita Popov 2020-12-12 20:47:23 +01:00
parent baf931a842
commit ff523aa441
1 changed files with 112 additions and 0 deletions
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112
llvm/test/Transforms/CorrelatedValuePropagation/basic.ll
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@ -278,6 +278,117 @@ next:
ret void
}
define void @switch_nonzero_zext(i8 %s) {
; CHECK-LABEL: @switch_nonzero_zext(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp ne i8 [[S:%.*]], 0
; CHECK-NEXT: br i1 [[CMP]], label [[SWITCH:%.*]], label [[EXIT:%.*]]
; CHECK: switch:
; CHECK-NEXT: [[S_EXT:%.*]] = zext i8 [[S]] to i32
; CHECK-NEXT: switch i32 [[S_EXT]], label [[EXIT]] [
; CHECK-NEXT: i32 0, label [[UNREACHABLE:%.*]]
; CHECK-NEXT: i32 1, label [[EXIT]]
; CHECK-NEXT: i32 -1, label [[EXIT]]
; CHECK-NEXT: ]
; CHECK: exit:
; CHECK-NEXT: ret void
; CHECK: unreachable:
; CHECK-NEXT: ret void
;
entry:
%cmp = icmp ne i8 %s, 0
br i1 %cmp, label %switch, label %exit
switch:
%s.ext = zext i8 %s to i32
switch i32 %s.ext, label %exit [
i32 0, label %unreachable
i32 1, label %exit
i32 -1, label %exit
]
exit:
ret void
unreachable:
ret void
}
define void @switch_assume_nonzero(i32 %s) {
; CHECK-LABEL: @switch_assume_nonzero(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp ne i32 [[S:%.*]], 0
; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
; CHECK-NEXT: switch i32 [[S]], label [[EXIT:%.*]] [
; CHECK-NEXT: i32 0, label [[UNREACHABLE:%.*]]
; CHECK-NEXT: i32 1, label [[EXIT]]
; CHECK-NEXT: i32 -1, label [[EXIT]]
; CHECK-NEXT: ]
; CHECK: exit:
; CHECK-NEXT: ret void
; CHECK: unreachable:
; CHECK-NEXT: ret void
;
entry:
%cmp = icmp ne i32 %s, 0
call void @llvm.assume(i1 %cmp)
switch i32 %s, label %exit [
i32 0, label %unreachable
i32 1, label %exit
i32 -1, label %exit
]
exit:
ret void
unreachable:
ret void
}
define void @switch_nonzero_phi(i1 %cond) {
; CHECK-LABEL: @switch_nonzero_phi(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[COND:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK: if:
; CHECK-NEXT: br label [[SWITCH:%.*]]
; CHECK: else:
; CHECK-NEXT: br label [[SWITCH]]
; CHECK: switch:
; CHECK-NEXT: [[S:%.*]] = phi i32 [ 1, [[IF]] ], [ -1, [[ELSE]] ]
; CHECK-NEXT: switch i32 [[S]], label [[EXIT:%.*]] [
; CHECK-NEXT: i32 0, label [[UNREACHABLE:%.*]]
; CHECK-NEXT: i32 1, label [[EXIT]]
; CHECK-NEXT: i32 -1, label [[EXIT]]
; CHECK-NEXT: ]
; CHECK: exit:
; CHECK-NEXT: ret void
; CHECK: unreachable:
; CHECK-NEXT: ret void
;
entry:
br i1 %cond, label %if, label %else
if:
br label %switch
else:
br label %switch
switch:
%s = phi i32 [ 1, %if ], [ -1, %else ]
switch i32 %s, label %exit [
i32 0, label %unreachable
i32 1, label %exit
i32 -1, label %exit
]
exit:
ret void
unreachable:
ret void
}
define i1 @arg_attribute(i8* nonnull %a) {
; CHECK-LABEL: @arg_attribute(
; CHECK-NEXT: ret i1 false
@ -966,3 +1077,4 @@ declare i32 @llvm.uadd.sat.i32(i32, i32)
declare i32 @llvm.usub.sat.i32(i32, i32)
declare i32 @llvm.sadd.sat.i32(i32, i32)
declare i32 @llvm.ssub.sat.i32(i32, i32)
declare void @llvm.assume(i1)