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clang-p2996/llvm/test/Transforms/SimplifyCFG/HoistCode.ll
Nikita Popov 8cdecd4d3a [IR] Add getelementptr nusw and nuw flags (#90824) 
This implements the `nusw` and `nuw` flags for `getelementptr` as
proposed at
https://discourse.llvm.org/t/rfc-add-nusw-and-nuw-flags-for-getelementptr/78672.

The three possible flags are encapsulated in the new `GEPNoWrapFlags`
class. Currently this class has a ctor from bool, interpreted as the
InBounds flag. This ctor should be removed in the future, as code gets
migrated to handle all flags.

There are a few places annotated with `TODO(gep_nowrap)`, where I've had
to touch code but opted to not infer or precisely preserve the new
flags, so as to keep this as NFC as possible and make sure any changes
of that kind get test coverage when they are made.
2024-05-27 16:05:17 +02:00

278 lines
6.7 KiB
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=simplifycfg -hoist-common-insts=true -S | FileCheck %s
; RUN: opt < %s -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -hoist-common-insts=true -S | FileCheck %s
define void @foo(i1 %C, ptr %P) {
; CHECK-LABEL: @foo(
; CHECK-NEXT: common.ret:
; CHECK-NEXT: store i32 7, ptr [[P:%.*]], align 4
; CHECK-NEXT: ret void
;
br i1 %C, label %T, label %F
T: ; preds = %0
store i32 7, ptr %P
ret void
F: ; preds = %0
store i32 7, ptr %P
ret void
}
define void @foo_switch(i64 %C, ptr %P) {
; CHECK-LABEL: @foo_switch(
; CHECK-NEXT: common.ret:
; CHECK-NEXT: store i32 7, ptr [[P:%.*]], align 4
; CHECK-NEXT: ret void
;
switch i64 %C, label %bb0 [
i64 1, label %bb1
i64 2, label %bb2
]
bb0: ; preds = %0
store i32 7, ptr %P
ret void
bb1: ; preds = %0
store i32 7, ptr %P
ret void
bb2: ; preds = %0
store i32 7, ptr %P
ret void
}
define float @PR39535min(float %x) {
; CHECK-LABEL: @PR39535min(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TOBOOL:%.*]] = fcmp une float [[X:%.*]], 0.000000e+00
; CHECK-NEXT: [[DOTX:%.*]] = select fast i1 [[TOBOOL]], float 0.000000e+00, float [[X]]
; CHECK-NEXT: ret float [[DOTX]]
;
entry:
%tobool = fcmp une float %x, 0.0
br i1 %tobool, label %cond.true, label %cond.false
cond.true:
br label %cond.end
cond.false:
br label %cond.end
cond.end:
%cond = phi fast float [ 0.0, %cond.true ], [ %x, %cond.false ]
ret float %cond
}
define float @PR39535min_switch(i64 %i, float %x) {
; CHECK-LABEL: @PR39535min_switch(
; CHECK-NEXT: entry:
; CHECK-NEXT: switch i64 [[I:%.*]], label [[END:%.*]] [
; CHECK-NEXT: i64 1, label [[BB1:%.*]]
; CHECK-NEXT: i64 2, label [[BB2:%.*]]
; CHECK-NEXT: ]
; CHECK: bb1:
; CHECK-NEXT: br label [[END]]
; CHECK: bb2:
; CHECK-NEXT: br label [[END]]
; CHECK: end:
; CHECK-NEXT: [[COND:%.*]] = phi fast float [ [[X:%.*]], [[BB1]] ], [ [[X]], [[BB2]] ], [ 0.000000e+00, [[ENTRY:%.*]] ]
; CHECK-NEXT: ret float [[COND]]
;
entry:
switch i64 %i, label %bb0 [
i64 1, label %bb1
i64 2, label %bb2
]
bb0:
br label %end
bb1:
br label %end
bb2:
br label %end
end:
%cond = phi fast float [ 0.0, %bb0 ], [ %x, %bb1 ], [ %x, %bb2 ]
ret float %cond
}
define i32 @hoist_zext_flags_preserve(i1 %C, i8 %x) {
; CHECK-LABEL: @hoist_zext_flags_preserve(
; CHECK-NEXT: common.ret:
; CHECK-NEXT: [[Z1:%.*]] = zext nneg i8 [[X:%.*]] to i32
; CHECK-NEXT: ret i32 [[Z1]]
;
br i1 %C, label %T, label %F
T:
%z1 = zext nneg i8 %x to i32
ret i32 %z1
F:
%z2 = zext nneg i8 %x to i32
ret i32 %z2
}
define i32 @hoist_zext_flags_drop(i1 %C, i8 %x) {
; CHECK-LABEL: @hoist_zext_flags_drop(
; CHECK-NEXT: common.ret:
; CHECK-NEXT: [[Z1:%.*]] = zext i8 [[X:%.*]] to i32
; CHECK-NEXT: ret i32 [[Z1]]
;
br i1 %C, label %T, label %F
T:
%z1 = zext nneg i8 %x to i32
ret i32 %z1
F:
%z2 = zext i8 %x to i32
ret i32 %z2
}
define float @hoist_uitofp_flags_preserve(i1 %C, i8 %x) {
; CHECK-LABEL: @hoist_uitofp_flags_preserve(
; CHECK-NEXT: common.ret:
; CHECK-NEXT: [[Z1:%.*]] = uitofp nneg i8 [[X:%.*]] to float
; CHECK-NEXT: ret float [[Z1]]
;
br i1 %C, label %T, label %F
T:
%z1 = uitofp nneg i8 %x to float
ret float %z1
F:
%z2 = uitofp nneg i8 %x to float
ret float %z2
}
define float @hoist_uitofp_flags_drop(i1 %C, i8 %x) {
; CHECK-LABEL: @hoist_uitofp_flags_drop(
; CHECK-NEXT: common.ret:
; CHECK-NEXT: [[Z1:%.*]] = uitofp i8 [[X:%.*]] to float
; CHECK-NEXT: ret float [[Z1]]
;
br i1 %C, label %T, label %F
T:
%z1 = uitofp nneg i8 %x to float
ret float %z1
F:
%z2 = uitofp i8 %x to float
ret float %z2
}
define i32 @hoist_or_flags_preserve(i1 %C, i32 %x, i32 %y) {
; CHECK-LABEL: @hoist_or_flags_preserve(
; CHECK-NEXT: common.ret:
; CHECK-NEXT: [[Z1:%.*]] = or disjoint i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: ret i32 [[Z1]]
;
br i1 %C, label %T, label %F
T:
%z1 = or disjoint i32 %x, %y
ret i32 %z1
F:
%z2 = or disjoint i32 %x, %y
ret i32 %z2
}
define i32 @hoist_or_flags_drop(i1 %C, i32 %x, i32 %y) {
; CHECK-LABEL: @hoist_or_flags_drop(
; CHECK-NEXT: common.ret:
; CHECK-NEXT: [[Z1:%.*]] = or i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: ret i32 [[Z1]]
;
br i1 %C, label %T, label %F
T:
%z1 = or i32 %x, %y
ret i32 %z1
F:
%z2 = or disjoint i32 %x, %y
ret i32 %z2
}
define i16 @hoist_trunc_flags_preserve(i1 %C, i32 %x) {
; CHECK-LABEL: @hoist_trunc_flags_preserve(
; CHECK-NEXT: common.ret:
; CHECK-NEXT: [[Z1:%.*]] = trunc nuw nsw i32 [[X:%.*]] to i16
; CHECK-NEXT: ret i16 [[Z1]]
;
br i1 %C, label %T, label %F
T:
%z1 = trunc nsw nuw i32 %x to i16
ret i16 %z1
F:
%z2 = trunc nsw nuw i32 %x to i16
ret i16 %z2
}
define i16 @hoist_trunc_flags_drop(i1 %C, i32 %x) {
; CHECK-LABEL: @hoist_trunc_flags_drop(
; CHECK-NEXT: common.ret:
; CHECK-NEXT: [[Z1:%.*]] = trunc i32 [[X:%.*]] to i16
; CHECK-NEXT: ret i16 [[Z1]]
;
br i1 %C, label %T, label %F
T:
%z1 = trunc i32 %x to i16
ret i16 %z1
F:
%z2 = trunc nsw nuw i32 %x to i16
ret i16 %z2
}
define ptr @hoist_gep_flags_both_nuw(i1 %C, ptr %p) {
; CHECK-LABEL: @hoist_gep_flags_both_nuw(
; CHECK-NEXT: common.ret:
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr nuw i8, ptr [[P:%.*]], i64 1
; CHECK-NEXT: ret ptr [[GEP1]]
;
br i1 %C, label %T, label %F
T:
%gep1 = getelementptr nuw i8, ptr %p, i64 1
ret ptr %gep1
F:
%gep2 = getelementptr nuw i8, ptr %p, i64 1
ret ptr %gep2
}
define ptr @hoist_gep_flags_both_nusw(i1 %C, ptr %p) {
; CHECK-LABEL: @hoist_gep_flags_both_nusw(
; CHECK-NEXT: common.ret:
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr nusw i8, ptr [[P:%.*]], i64 1
; CHECK-NEXT: ret ptr [[GEP1]]
;
br i1 %C, label %T, label %F
T:
%gep1 = getelementptr nusw i8, ptr %p, i64 1
ret ptr %gep1
F:
%gep2 = getelementptr nusw i8, ptr %p, i64 1
ret ptr %gep2
}
define ptr @hoist_gep_flags_intersect1(i1 %C, ptr %p) {
; CHECK-LABEL: @hoist_gep_flags_intersect1(
; CHECK-NEXT: common.ret:
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr nusw i8, ptr [[P:%.*]], i64 1
; CHECK-NEXT: ret ptr [[GEP1]]
;
br i1 %C, label %T, label %F
T:
%gep1 = getelementptr inbounds nuw i8, ptr %p, i64 1
ret ptr %gep1
F:
%gep2 = getelementptr nusw i8, ptr %p, i64 1
ret ptr %gep2
}
define ptr @hoist_gep_flags_intersect2(i1 %C, ptr %p) {
; CHECK-LABEL: @hoist_gep_flags_intersect2(
; CHECK-NEXT: common.ret:
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr i8, ptr [[P:%.*]], i64 1
; CHECK-NEXT: ret ptr [[GEP1]]
;
br i1 %C, label %T, label %F
T:
%gep1 = getelementptr inbounds i8, ptr %p, i64 1
ret ptr %gep1
F:
%gep2 = getelementptr nuw i8, ptr %p, i64 1
ret ptr %gep2
}
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