llvm/test/Transforms/IndVarSimplify/widen-loop-comp.ll - rust-lang/llvm-project - Git at Google

 ; RUN: opt < %s -indvars -S | FileCheck %s
 target triple = "aarch64--linux-gnu"

 ; Provide legal integer types.
 target datalayout = "n8:16:32:64"


 ; Check the loop exit i32 compare instruction and operand are widened to i64
 ; instead of truncating IV before its use in the i32 compare instruction.

 @idx = common global i32 0, align 4
 @e = common global i32 0, align 4
 @ptr = common global i32* null, align 8

 ; CHECK-LABEL: @test1
 ; CHECK: for.body.lr.ph:
 ; CHECK: sext i32
 ; CHECK: for.cond:
 ; CHECK: icmp slt i64
 ; CHECK: for.body:
 ; CHECK: phi i64

 define i32 @test1() {
 entry:
   store i32 -1, i32* @idx, align 4
   %0 = load i32, i32* @e, align 4
   %cmp4 = icmp slt i32 %0, 0
   br i1 %cmp4, label %for.end.loopexit, label %for.body.lr.ph

 for.body.lr.ph:
   %1 = load i32*, i32** @ptr, align 8
   %2 = load i32, i32* @e, align 4
   br label %for.body

 for.cond:
   %inc = add nsw i32 %i.05, 1
   %cmp = icmp slt i32 %i.05, %2
   br i1 %cmp, label %for.body, label %for.cond.for.end.loopexit_crit_edge

 for.body:
   %i.05 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.cond ]
   %idxprom = sext i32 %i.05 to i64
   %arrayidx = getelementptr inbounds i32, i32* %1, i64 %idxprom
   %3 = load i32, i32* %arrayidx, align 4
   %tobool = icmp eq i32 %3, 0
   br i1 %tobool, label %if.then, label %for.cond

 if.then:
   %i.05.lcssa = phi i32 [ %i.05, %for.body ]
   store i32 %i.05.lcssa, i32* @idx, align 4
   br label %for.end

 for.cond.for.end.loopexit_crit_edge:
   br label %for.end.loopexit

 for.end.loopexit:
   br label %for.end

 for.end:
   %4 = load i32, i32* @idx, align 4
   ret i32 %4
 }

 ; CHECK-LABEL: @test2
 ; CHECK: for.body4.us
 ; CHECK: %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
 ; CHECK: %cmp2.us = icmp ult i64
 ; CHECK-NOT: %2 = trunc i64 %indvars.iv.next to i32
 ; CHECK-NOT: %cmp2.us = icmp slt i32

 define void @test2([8 x i8]* %a, i8* %b, i8 %limit) {
 entry:
   %conv = zext i8 %limit to i32
   br i1 undef, label %for.cond1.preheader, label %for.cond1.preheader.us

 for.cond1.preheader.us:
   %storemerge5.us = phi i32 [ 0, %entry ], [ %inc14.us, %for.inc13.us ]
   br i1 true, label %for.body4.lr.ph.us, label %for.inc13.us

 for.inc13.us:
   %inc14.us = add nsw i32 %storemerge5.us, 1
   %cmp.us = icmp slt i32 %inc14.us, 4
   br i1 %cmp.us, label %for.cond1.preheader.us, label %for.end

 for.body4.us:
   %storemerge14.us = phi i32 [ 0, %for.body4.lr.ph.us ], [ %inc.us, %for.body4.us ]
   %idxprom.us = sext i32 %storemerge14.us to i64
   %arrayidx6.us = getelementptr inbounds [8 x i8], [8 x i8]* %a, i64 %idxprom5.us, i64 %idxprom.us
   %0 = load i8, i8* %arrayidx6.us, align 1
   %idxprom7.us = zext i8 %0 to i64
   %arrayidx8.us = getelementptr inbounds i8, i8* %b, i64 %idxprom7.us
   %1 = load i8, i8* %arrayidx8.us, align 1
   store i8 %1, i8* %arrayidx6.us, align 1
   %inc.us = add nsw i32 %storemerge14.us, 1
   %cmp2.us = icmp slt i32 %inc.us, %conv
   br i1 %cmp2.us, label %for.body4.us, label %for.inc13.us

 for.body4.lr.ph.us:
   %idxprom5.us = sext i32 %storemerge5.us to i64
   br label %for.body4.us

 for.cond1.preheader:
   %storemerge5 = phi i32 [ 0, %entry ], [ %inc14, %for.inc13 ]
   br i1 false, label %for.inc13, label %for.inc13

 for.inc13:
   %inc14 = add nsw i32 %storemerge5, 1
   %cmp = icmp slt i32 %inc14, 4
   br i1 %cmp, label %for.cond1.preheader, label %for.end

 for.end:
   ret void
 }

 ; CHECK-LABEL: @test3
 ; CHECK: sext i32 %b
 ; CHECK: for.cond:
 ; CHECK: phi i64
 ; CHECK: icmp slt i64

 define i32 @test3(i32* %a, i32 %b) {
 entry:
   br label %for.cond

 for.cond:
   %sum.0 = phi i32 [ 0, %entry ], [ %add, %for.body ]
   %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
   %cmp = icmp slt i32 %i.0, %b
   br i1 %cmp, label %for.body, label %for.end

 for.body:
   %idxprom = sext i32 %i.0 to i64
   %arrayidx = getelementptr inbounds i32, i32* %a, i64 %idxprom
   %0 = load i32, i32* %arrayidx, align 4
   %add = add nsw i32 %sum.0, %0
   %inc = add nsw i32 %i.0, 1
   br label %for.cond

 for.end:
   ret i32 %sum.0
 }

 declare i32 @fn1(i8 signext)

 ; PR21030
 ; CHECK-LABEL: @test4
 ; CHECK: for.body:
 ; CHECK: phi i32
 ; CHECK: icmp sgt i8

 define i32 @test4(i32 %a) {
 entry:
   br label %for.body

 for.body:
   %c.07 = phi i8 [ -3, %entry ], [ %dec, %for.body ]
   %conv6 = zext i8 %c.07 to i32
   %or = or i32 %a, %conv6
   %conv3 = trunc i32 %or to i8
   %call = call i32 @fn1(i8 signext %conv3)
   %dec = add i8 %c.07, -1
   %cmp = icmp sgt i8 %dec, -14
   br i1 %cmp, label %for.body, label %for.end

 for.end:
   ret i32 0
 }

 ; CHECK-LABEL: @test5
 ; CHECK: zext i32 %b
 ; CHECK: for.cond:
 ; CHECK: phi i64
 ; CHECK: icmp ule i64

 define i32 @test5(i32* %a, i32 %b) {
 entry:
   br label %for.cond

 for.cond:
   %sum.0 = phi i32 [ 0, %entry ], [ %add, %for.body ]
   %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
   %cmp = icmp ule i32 %i.0, %b
   br i1 %cmp, label %for.body, label %for.end

 for.body:
   %idxprom = zext i32 %i.0 to i64
   %arrayidx = getelementptr inbounds i32, i32* %a, i64 %idxprom
   %0 = load i32, i32* %arrayidx, align 4
   %add = add nsw i32 %sum.0, %0
   %inc = add nsw i32 %i.0, 1
   br label %for.cond

 for.end:
   ret i32 %sum.0
 }

 define i32 @test6(i32* %a, i32 %b) {
 ; CHECK-LABEL: @test6(
 ; CHECK: [[B_SEXT:%[a-z0-9]+]] = sext i32 %b to i64
 ; CHECK: for.cond:
 ; CHECK: icmp sle i64 %indvars.iv, [[B_SEXT]]

 entry:
   br label %for.cond

 for.cond:
   %sum.0 = phi i32 [ 0, %entry ], [ %add, %for.body ]
   %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
   %cmp = icmp sle i32 %i.0, %b
   br i1 %cmp, label %for.body, label %for.end

 for.body:
   %idxprom = zext i32 %i.0 to i64
   %arrayidx = getelementptr inbounds i32, i32* %a, i64 %idxprom
   %0 = load i32, i32* %arrayidx, align 4
   %add = add nsw i32 %sum.0, %0
   %inc = add nsw i32 %i.0, 1
   br label %for.cond

 for.end:
   ret i32 %sum.0
 }

 define i32 @test7(i32* %a, i32 %b) {
 ; CHECK-LABEL: @test7(
 ; CHECK: [[B_ZEXT:%[a-z0-9]+]] = zext i32 %b to i64
 ; CHECK: [[B_SEXT:%[a-z0-9]+]] = sext i32 %b to i64
 ; CHECK: for.cond:
 ; CHECK: icmp ule i64 %indvars.iv, [[B_ZEXT]]
 ; CHECK: for.body:
 ; CHECK: icmp sle i64 %indvars.iv, [[B_SEXT]]

 entry:
   br label %for.cond

 for.cond:
   %sum.0 = phi i32 [ 0, %entry ], [ %add, %for.body ]
   %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
   %cmp = icmp ule i32 %i.0, %b
   br i1 %cmp, label %for.body, label %for.end

 for.body:
   %idxprom = sext i32 %i.0 to i64
   %arrayidx = getelementptr inbounds i32, i32* %a, i64 %idxprom
   %0 = load i32, i32* %arrayidx, align 4
   %add = add nsw i32 %sum.0, %0
   %inc = add nsw i32 %i.0, 1
   %cmp2 = icmp sle i32 %i.0, %b
   br i1 %cmp2, label %for.cond, label %for.end

 for.end:
   ret i32 %sum.0
 }

 define i32 @test8(i32* %a, i32 %b, i32 %init) {
 ; CHECK-LABEL: @test8(
 ; CHECK: [[INIT_SEXT:%[a-z0-9]+]] = sext i32 %init to i64
 ; CHECK: [[B_ZEXT:%[a-z0-9]+]] = zext i32 %b to i64
 ; CHECK: for.cond:
 ;     Note: %indvars.iv is the sign extension of %i.0
 ; CHECK: %indvars.iv = phi i64 [ [[INIT_SEXT]], %for.cond.preheader ], [ %indvars.iv.next, %for.body ]
 ; CHECK: icmp ule i64 %indvars.iv, [[B_ZEXT]]

 entry:
   %e = icmp sgt i32 %init, 0
   br i1 %e, label %for.cond, label %leave

 for.cond:
   %sum.0 = phi i32 [ 0, %entry ], [ %add, %for.body ]
   %i.0 = phi i32 [ %init, %entry ], [ %inc, %for.body ]
   %cmp = icmp ule i32 %i.0, %b
   br i1 %cmp, label %for.body, label %for.end

 for.body:
   %idxprom = sext i32 %i.0 to i64
   %arrayidx = getelementptr inbounds i32, i32* %a, i64 %idxprom
   %0 = load i32, i32* %arrayidx, align 4
   %add = add nsw i32 %sum.0, %0
   %inc = add nsw i32 %i.0, 1
   %cmp2 = icmp slt i32 0, %inc
   br i1 %cmp2, label %for.cond, label %for.end

 for.end:
   ret i32 %sum.0

 leave:
   ret i32 0
 }

 define i32 @test9(i32* %a, i32 %b, i32 %init) {
 ; CHECK-LABEL: @test9(
 ; CHECK: [[INIT_ZEXT:%[a-z0-9]+]] = zext i32 %init to i64
 ; CHECK: [[B_SEXT:%[a-z0-9]+]] = sext i32 %b to i64
 ; CHECK: for.cond:
 ;     Note: %indvars.iv is the zero extension of %i.0
 ; CHECK: %indvars.iv = phi i64 [ [[INIT_ZEXT]], %for.cond.preheader ], [ %indvars.iv.next, %for.body ]
 ; CHECK: icmp slt i64 %indvars.iv, [[B_SEXT]]

 entry:
   %e = icmp sgt i32 %init, 0
   br i1 %e, label %for.cond, label %leave

 for.cond:
   %sum.0 = phi i32 [ 0, %entry ], [ %add, %for.body ]
   %i.0 = phi i32 [ %init, %entry ], [ %inc, %for.body ]
   %cmp = icmp slt i32 %i.0, %b
   br i1 %cmp, label %for.body, label %for.end

 for.body:
   %idxprom = zext i32 %i.0 to i64
   %arrayidx = getelementptr inbounds i32, i32* %a, i64 %idxprom
   %0 = load i32, i32* %arrayidx, align 4
   %add = add nsw i32 %sum.0, %0
   %inc = add nsw i32 %i.0, 1
   %cmp2 = icmp slt i32 0, %inc
   br i1 %cmp2, label %for.cond, label %for.end

 for.end:
   ret i32 %sum.0

 leave:
   ret i32 0
 }

 declare void @consume.i64(i64)
 declare void @consume.i1(i1)

 define i32 @test10(i32 %v) {
 ; CHECK-LABEL: @test10(
  entry:
 ; CHECK-NOT: zext
   br label %loop

  loop:
 ; CHECK: [[WIDE_V:%[a-z0-9]+]] = sext i32 %v to i64
 ; CHECK: loop:
 ; CHECK: %indvars.iv = phi i64 [ %indvars.iv.next, %loop ], [ 0, %entry ]
 ; CHECK: %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
 ; CHECK: [[MUL:%[a-z0-9]+]] = mul nsw i64 %indvars.iv, -1
 ; CHECK: [[CMP:%[a-z0-9]+]] = icmp eq i64 [[MUL]], [[WIDE_V]]
 ; CHECK: call void @consume.i1(i1 [[CMP]])

   %i = phi i32 [ 0, %entry ], [ %i.inc, %loop ]
   %i.inc = add i32 %i, 1
   %iv = mul i32 %i, -1
   %cmp = icmp eq i32 %iv, %v
   call void @consume.i1(i1 %cmp)
   %be.cond = icmp slt i32 %i.inc, 11
   %ext = sext i32 %iv to i64
   call void @consume.i64(i64 %ext)
   br i1 %be.cond, label %loop, label %leave

  leave:
   ret i32 22
 }
	; RUN: opt < %s -indvars -S \| FileCheck %s
	target triple = "aarch64--linux-gnu"

	; Provide legal integer types.
	target datalayout = "n8:16:32:64"


	; Check the loop exit i32 compare instruction and operand are widened to i64
	; instead of truncating IV before its use in the i32 compare instruction.

	@idx = common global i32 0, align 4
	@e = common global i32 0, align 4
	@ptr = common global i32* null, align 8

	; CHECK-LABEL: @test1
	; CHECK: for.body.lr.ph:
	; CHECK: sext i32
	; CHECK: for.cond:
	; CHECK: icmp slt i64
	; CHECK: for.body:
	; CHECK: phi i64

	define i32 @test1() {
	entry:
	store i32 -1, i32* @idx, align 4
	%0 = load i32, i32* @e, align 4
	%cmp4 = icmp slt i32 %0, 0
	br i1 %cmp4, label %for.end.loopexit, label %for.body.lr.ph

	for.body.lr.ph:
	%1 = load i32, i32* @ptr, align 8
	%2 = load i32, i32* @e, align 4
	br label %for.body

	for.cond:
	%inc = add nsw i32 %i.05, 1
	%cmp = icmp slt i32 %i.05, %2
	br i1 %cmp, label %for.body, label %for.cond.for.end.loopexit_crit_edge

	for.body:
	%i.05 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.cond ]
	%idxprom = sext i32 %i.05 to i64
	%arrayidx = getelementptr inbounds i32, i32* %1, i64 %idxprom
	%3 = load i32, i32* %arrayidx, align 4
	%tobool = icmp eq i32 %3, 0
	br i1 %tobool, label %if.then, label %for.cond

	if.then:
	%i.05.lcssa = phi i32 [ %i.05, %for.body ]
	store i32 %i.05.lcssa, i32* @idx, align 4
	br label %for.end

	for.cond.for.end.loopexit_crit_edge:
	br label %for.end.loopexit

	for.end.loopexit:
	br label %for.end

	for.end:
	%4 = load i32, i32* @idx, align 4
	ret i32 %4
	}

	; CHECK-LABEL: @test2
	; CHECK: for.body4.us
	; CHECK: %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
	; CHECK: %cmp2.us = icmp ult i64
	; CHECK-NOT: %2 = trunc i64 %indvars.iv.next to i32
	; CHECK-NOT: %cmp2.us = icmp slt i32

	define void @test2([8 x i8]* %a, i8* %b, i8 %limit) {
	entry:
	%conv = zext i8 %limit to i32
	br i1 undef, label %for.cond1.preheader, label %for.cond1.preheader.us

	for.cond1.preheader.us:
	%storemerge5.us = phi i32 [ 0, %entry ], [ %inc14.us, %for.inc13.us ]
	br i1 true, label %for.body4.lr.ph.us, label %for.inc13.us

	for.inc13.us:
	%inc14.us = add nsw i32 %storemerge5.us, 1
	%cmp.us = icmp slt i32 %inc14.us, 4
	br i1 %cmp.us, label %for.cond1.preheader.us, label %for.end

	for.body4.us:
	%storemerge14.us = phi i32 [ 0, %for.body4.lr.ph.us ], [ %inc.us, %for.body4.us ]
	%idxprom.us = sext i32 %storemerge14.us to i64
	%arrayidx6.us = getelementptr inbounds [8 x i8], [8 x i8]* %a, i64 %idxprom5.us, i64 %idxprom.us
	%0 = load i8, i8* %arrayidx6.us, align 1
	%idxprom7.us = zext i8 %0 to i64
	%arrayidx8.us = getelementptr inbounds i8, i8* %b, i64 %idxprom7.us
	%1 = load i8, i8* %arrayidx8.us, align 1
	store i8 %1, i8* %arrayidx6.us, align 1
	%inc.us = add nsw i32 %storemerge14.us, 1
	%cmp2.us = icmp slt i32 %inc.us, %conv
	br i1 %cmp2.us, label %for.body4.us, label %for.inc13.us

	for.body4.lr.ph.us:
	%idxprom5.us = sext i32 %storemerge5.us to i64
	br label %for.body4.us

	for.cond1.preheader:
	%storemerge5 = phi i32 [ 0, %entry ], [ %inc14, %for.inc13 ]
	br i1 false, label %for.inc13, label %for.inc13

	for.inc13:
	%inc14 = add nsw i32 %storemerge5, 1
	%cmp = icmp slt i32 %inc14, 4
	br i1 %cmp, label %for.cond1.preheader, label %for.end

	for.end:
	ret void
	}

	; CHECK-LABEL: @test3
	; CHECK: sext i32 %b
	; CHECK: for.cond:
	; CHECK: phi i64
	; CHECK: icmp slt i64

	define i32 @test3(i32* %a, i32 %b) {
	entry:
	br label %for.cond

	for.cond:
	%sum.0 = phi i32 [ 0, %entry ], [ %add, %for.body ]
	%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
	%cmp = icmp slt i32 %i.0, %b
	br i1 %cmp, label %for.body, label %for.end

	for.body:
	%idxprom = sext i32 %i.0 to i64
	%arrayidx = getelementptr inbounds i32, i32* %a, i64 %idxprom
	%0 = load i32, i32* %arrayidx, align 4
	%add = add nsw i32 %sum.0, %0
	%inc = add nsw i32 %i.0, 1
	br label %for.cond

	for.end:
	ret i32 %sum.0
	}

	declare i32 @fn1(i8 signext)

	; PR21030
	; CHECK-LABEL: @test4
	; CHECK: for.body:
	; CHECK: phi i32
	; CHECK: icmp sgt i8

	define i32 @test4(i32 %a) {
	entry:
	br label %for.body

	for.body:
	%c.07 = phi i8 [ -3, %entry ], [ %dec, %for.body ]
	%conv6 = zext i8 %c.07 to i32
	%or = or i32 %a, %conv6
	%conv3 = trunc i32 %or to i8
	%call = call i32 @fn1(i8 signext %conv3)
	%dec = add i8 %c.07, -1
	%cmp = icmp sgt i8 %dec, -14
	br i1 %cmp, label %for.body, label %for.end

	for.end:
	ret i32 0
	}

	; CHECK-LABEL: @test5
	; CHECK: zext i32 %b
	; CHECK: for.cond:
	; CHECK: phi i64
	; CHECK: icmp ule i64

	define i32 @test5(i32* %a, i32 %b) {
	entry:
	br label %for.cond

	for.cond:
	%sum.0 = phi i32 [ 0, %entry ], [ %add, %for.body ]
	%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
	%cmp = icmp ule i32 %i.0, %b
	br i1 %cmp, label %for.body, label %for.end

	for.body:
	%idxprom = zext i32 %i.0 to i64
	%arrayidx = getelementptr inbounds i32, i32* %a, i64 %idxprom
	%0 = load i32, i32* %arrayidx, align 4
	%add = add nsw i32 %sum.0, %0
	%inc = add nsw i32 %i.0, 1
	br label %for.cond

	for.end:
	ret i32 %sum.0
	}

	define i32 @test6(i32* %a, i32 %b) {
	; CHECK-LABEL: @test6(
	; CHECK: [[B_SEXT:%[a-z0-9]+]] = sext i32 %b to i64
	; CHECK: for.cond:
	; CHECK: icmp sle i64 %indvars.iv, [[B_SEXT]]

	entry:
	br label %for.cond

	for.cond:
	%sum.0 = phi i32 [ 0, %entry ], [ %add, %for.body ]
	%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
	%cmp = icmp sle i32 %i.0, %b
	br i1 %cmp, label %for.body, label %for.end

	for.body:
	%idxprom = zext i32 %i.0 to i64
	%arrayidx = getelementptr inbounds i32, i32* %a, i64 %idxprom
	%0 = load i32, i32* %arrayidx, align 4
	%add = add nsw i32 %sum.0, %0
	%inc = add nsw i32 %i.0, 1
	br label %for.cond

	for.end:
	ret i32 %sum.0
	}

	define i32 @test7(i32* %a, i32 %b) {
	; CHECK-LABEL: @test7(
	; CHECK: [[B_ZEXT:%[a-z0-9]+]] = zext i32 %b to i64
	; CHECK: [[B_SEXT:%[a-z0-9]+]] = sext i32 %b to i64
	; CHECK: for.cond:
	; CHECK: icmp ule i64 %indvars.iv, [[B_ZEXT]]
	; CHECK: for.body:
	; CHECK: icmp sle i64 %indvars.iv, [[B_SEXT]]

	entry:
	br label %for.cond

	for.cond:
	%sum.0 = phi i32 [ 0, %entry ], [ %add, %for.body ]
	%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
	%cmp = icmp ule i32 %i.0, %b
	br i1 %cmp, label %for.body, label %for.end

	for.body:
	%idxprom = sext i32 %i.0 to i64
	%arrayidx = getelementptr inbounds i32, i32* %a, i64 %idxprom
	%0 = load i32, i32* %arrayidx, align 4
	%add = add nsw i32 %sum.0, %0
	%inc = add nsw i32 %i.0, 1
	%cmp2 = icmp sle i32 %i.0, %b
	br i1 %cmp2, label %for.cond, label %for.end

	for.end:
	ret i32 %sum.0
	}

	define i32 @test8(i32* %a, i32 %b, i32 %init) {
	; CHECK-LABEL: @test8(
	; CHECK: [[INIT_SEXT:%[a-z0-9]+]] = sext i32 %init to i64
	; CHECK: [[B_ZEXT:%[a-z0-9]+]] = zext i32 %b to i64
	; CHECK: for.cond:
	; Note: %indvars.iv is the sign extension of %i.0
	; CHECK: %indvars.iv = phi i64 [ [[INIT_SEXT]], %for.cond.preheader ], [ %indvars.iv.next, %for.body ]
	; CHECK: icmp ule i64 %indvars.iv, [[B_ZEXT]]

	entry:
	%e = icmp sgt i32 %init, 0
	br i1 %e, label %for.cond, label %leave

	for.cond:
	%sum.0 = phi i32 [ 0, %entry ], [ %add, %for.body ]
	%i.0 = phi i32 [ %init, %entry ], [ %inc, %for.body ]
	%cmp = icmp ule i32 %i.0, %b
	br i1 %cmp, label %for.body, label %for.end

	for.body:
	%idxprom = sext i32 %i.0 to i64
	%arrayidx = getelementptr inbounds i32, i32* %a, i64 %idxprom
	%0 = load i32, i32* %arrayidx, align 4
	%add = add nsw i32 %sum.0, %0
	%inc = add nsw i32 %i.0, 1
	%cmp2 = icmp slt i32 0, %inc
	br i1 %cmp2, label %for.cond, label %for.end

	for.end:
	ret i32 %sum.0

	leave:
	ret i32 0
	}

	define i32 @test9(i32* %a, i32 %b, i32 %init) {
	; CHECK-LABEL: @test9(
	; CHECK: [[INIT_ZEXT:%[a-z0-9]+]] = zext i32 %init to i64
	; CHECK: [[B_SEXT:%[a-z0-9]+]] = sext i32 %b to i64
	; CHECK: for.cond:
	; Note: %indvars.iv is the zero extension of %i.0
	; CHECK: %indvars.iv = phi i64 [ [[INIT_ZEXT]], %for.cond.preheader ], [ %indvars.iv.next, %for.body ]
	; CHECK: icmp slt i64 %indvars.iv, [[B_SEXT]]

	entry:
	%e = icmp sgt i32 %init, 0
	br i1 %e, label %for.cond, label %leave

	for.cond:
	%sum.0 = phi i32 [ 0, %entry ], [ %add, %for.body ]
	%i.0 = phi i32 [ %init, %entry ], [ %inc, %for.body ]
	%cmp = icmp slt i32 %i.0, %b
	br i1 %cmp, label %for.body, label %for.end

	for.body:
	%idxprom = zext i32 %i.0 to i64
	%arrayidx = getelementptr inbounds i32, i32* %a, i64 %idxprom
	%0 = load i32, i32* %arrayidx, align 4
	%add = add nsw i32 %sum.0, %0
	%inc = add nsw i32 %i.0, 1
	%cmp2 = icmp slt i32 0, %inc
	br i1 %cmp2, label %for.cond, label %for.end

	for.end:
	ret i32 %sum.0

	leave:
	ret i32 0
	}

	declare void @consume.i64(i64)
	declare void @consume.i1(i1)

	define i32 @test10(i32 %v) {
	; CHECK-LABEL: @test10(
	entry:
	; CHECK-NOT: zext
	br label %loop

	loop:
	; CHECK: [[WIDE_V:%[a-z0-9]+]] = sext i32 %v to i64
	; CHECK: loop:
	; CHECK: %indvars.iv = phi i64 [ %indvars.iv.next, %loop ], [ 0, %entry ]
	; CHECK: %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
	; CHECK: [[MUL:%[a-z0-9]+]] = mul nsw i64 %indvars.iv, -1
	; CHECK: [[CMP:%[a-z0-9]+]] = icmp eq i64 [[MUL]], [[WIDE_V]]
	; CHECK: call void @consume.i1(i1 [[CMP]])

	%i = phi i32 [ 0, %entry ], [ %i.inc, %loop ]
	%i.inc = add i32 %i, 1
	%iv = mul i32 %i, -1
	%cmp = icmp eq i32 %iv, %v
	call void @consume.i1(i1 %cmp)
	%be.cond = icmp slt i32 %i.inc, 11
	%ext = sext i32 %iv to i64
	call void @consume.i64(i64 %ext)
	br i1 %be.cond, label %loop, label %leave

	leave:
	ret i32 22
	}