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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -aggressive-instcombine -S | FileCheck %s
define i16 @trunc_phi(i8 %x) {
; CHECK-LABEL: @trunc_phi(
; CHECK-NEXT: LoopHeader:
; CHECK-NEXT: [[ZEXT:%.*]] = zext i8 [[X:%.*]] to i16
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: Loop:
; CHECK-NEXT: [[ZEXT2:%.*]] = phi i16 [ [[ZEXT]], [[LOOPHEADER:%.*]] ], [ [[SHL:%.*]], [[LOOP]] ]
; CHECK-NEXT: [[J:%.*]] = phi i32 [ 0, [[LOOPHEADER]] ], [ [[I:%.*]], [[LOOP]] ]
; CHECK-NEXT: [[SHL]] = shl i16 [[ZEXT2]], 1
; CHECK-NEXT: [[I]] = add i32 [[J]], 1
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[I]], 10
; CHECK-NEXT: br i1 [[CMP]], label [[LOOPEND:%.*]], label [[LOOP]]
; CHECK: LoopEnd:
; CHECK-NEXT: ret i16 [[SHL]]
;
LoopHeader:
%zext = zext i8 %x to i32
br label %Loop
Loop:
%zext2 = phi i32 [%zext, %LoopHeader], [%shl, %Loop]
%j = phi i32 [0, %LoopHeader], [%i, %Loop]
%shl = shl i32 %zext2, 1
%trunc = trunc i32 %shl to i16
%i = add i32 %j, 1
%cmp = icmp eq i32 %i, 10
br i1 %cmp, label %LoopEnd, label %Loop
LoopEnd:
ret i16 %trunc
}
define i16 @trunc_phi2(i8 %x, i32 %sw) {
; CHECK-LABEL: @trunc_phi2(
; CHECK-NEXT: LoopHeader:
; CHECK-NEXT: [[ZEXT:%.*]] = zext i8 [[X:%.*]] to i16
; CHECK-NEXT: switch i32 [[SW:%.*]], label [[LOOPEND:%.*]] [
; CHECK-NEXT: i32 0, label [[LOOP:%.*]]
; CHECK-NEXT: i32 1, label [[LOOP]]
; CHECK-NEXT: ]
; CHECK: Loop:
; CHECK-NEXT: [[ZEXT2:%.*]] = phi i16 [ [[ZEXT]], [[LOOPHEADER:%.*]] ], [ [[ZEXT]], [[LOOPHEADER]] ], [ [[SHL:%.*]], [[LOOP]] ]
; CHECK-NEXT: [[J:%.*]] = phi i32 [ 0, [[LOOPHEADER]] ], [ 0, [[LOOPHEADER]] ], [ [[I:%.*]], [[LOOP]] ]
; CHECK-NEXT: [[SHL]] = shl i16 [[ZEXT2]], 1
; CHECK-NEXT: [[I]] = add i32 [[J]], 1
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[I]], 10
; CHECK-NEXT: br i1 [[CMP]], label [[LOOPEND]], label [[LOOP]]
; CHECK: LoopEnd:
; CHECK-NEXT: [[ZEXT3:%.*]] = phi i16 [ [[ZEXT]], [[LOOPHEADER]] ], [ [[ZEXT2]], [[LOOP]] ]
; CHECK-NEXT: ret i16 [[ZEXT3]]
;
LoopHeader:
%zext = zext i8 %x to i32
switch i32 %sw, label %LoopEnd [ i32 0, label %Loop
i32 1, label %Loop ]
Loop:
%zext2 = phi i32 [%zext, %LoopHeader], [%zext, %LoopHeader], [%shl, %Loop]
%j = phi i32 [0, %LoopHeader], [0, %LoopHeader], [%i, %Loop]
%shl = shl i32 %zext2, 1
%i = add i32 %j, 1
%cmp = icmp eq i32 %i, 10
br i1 %cmp, label %LoopEnd, label %Loop
LoopEnd:
%zext3 = phi i32 [%zext, %LoopHeader], [%zext2, %Loop]
%trunc = trunc i32 %zext3 to i16
ret i16 %trunc
}
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