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llvm-mirror/test/Transforms/IndVarSimplify/iv-widen-elim-ext.ll
Abderrazek Zaafrani 58be3eed37 [SimplifyIndVar] Avoid generating truncate instructions with non-hoisted Laod operand. 
Differential Revision: https://reviews.llvm.org/D49151

llvm-svn: 341726
2018-09-07 22:41:57 +00:00

360 lines
16 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -indvars -S | FileCheck %s
target datalayout = "e-m:e-i64:64-p:64:64:64-n8:16:32:64-S128"
; When widening IV and its users, trunc and zext/sext are not needed
; if the original 32-bit user is known to be non-negative, whether
; the IV is considered signed or unsigned.
define void @foo(i32* %A, i32* %B, i32* %C, i32 %N) {
; CHECK-LABEL: @foo(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 0, %N
; CHECK-NEXT: br i1 [[CMP1]], label %for.body.lr.ph, label %for.end
; CHECK: for.body.lr.ph:
; CHECK-NEXT: br label %for.body
; CHECK: for.body:
; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV:%.*]].next, %for.inc ], [ 0, %for.body.lr.ph ]
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i32, i32* %B, i64 [[INDVARS_IV]]
; CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* [[ARRAYIDX]], align 4
; CHECK-NEXT: [[TMP1:%.*]] = add nuw nsw i64 [[INDVARS_IV]], 2
; CHECK-NEXT: [[ARRAYIDX2:%.*]] = getelementptr inbounds i32, i32* %C, i64 [[TMP1]]
; CHECK-NEXT: [[TMP2:%.*]] = load i32, i32* [[ARRAYIDX2]], align 4
; CHECK-NEXT: [[ADD3:%.*]] = add nsw i32 [[TMP0]], [[TMP2]]
; CHECK-NEXT: [[TRUNC0:%.*]] = trunc i64 [[TMP1]] to i32
; CHECK-NEXT: [[DIV0:%.*]] = udiv i32 5, [[TRUNC0]]
; CHECK-NEXT: [[ADD4:%.*]] = add nsw i32 [[ADD3]], [[DIV0]]
; CHECK-NEXT: [[ARRAYIDX5:%.*]] = getelementptr inbounds i32, i32* %A, i64 [[INDVARS_IV]]
; CHECK-NEXT: store i32 [[ADD4]], i32* [[ARRAYIDX5]], align 4
; CHECK-NEXT: br label %for.inc
; CHECK: for.inc:
; CHECK-NEXT: [[INDVARS_IV_NEXT:%.*]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT: [[WIDE_TRIP_COUNT:%.*]] = zext i32 %N to i64
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i64 [[INDVARS_IV_NEXT]], [[WIDE_TRIP_COUNT]]
; CHECK-NEXT: br i1 [[EXITCOND]], label %for.body, label %for.cond.for.end_crit_edge
; CHECK: for.cond.for.end_crit_edge:
; CHECK-NEXT: br label %for.end
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
%cmp1 = icmp slt i32 0, %N
br i1 %cmp1, label %for.body.lr.ph, label %for.end
for.body.lr.ph: ; preds = %entry
br label %for.body
for.body: ; preds = %for.body.lr.ph, %for.inc
%i.02 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.inc ]
%idxprom = sext i32 %i.02 to i64
%arrayidx = getelementptr inbounds i32, i32* %B, i64 %idxprom
%0 = load i32, i32* %arrayidx, align 4
%add = add nsw i32 %i.02, 2
%idxprom1 = zext i32 %add to i64
%arrayidx2 = getelementptr inbounds i32, i32* %C, i64 %idxprom1
%1 = load i32, i32* %arrayidx2, align 4
%add3 = add nsw i32 %0, %1
%div0 = udiv i32 5, %add
%add4 = add nsw i32 %add3, %div0
%idxprom4 = zext i32 %i.02 to i64
%arrayidx5 = getelementptr inbounds i32, i32* %A, i64 %idxprom4
store i32 %add4, i32* %arrayidx5, align 4
br label %for.inc
for.inc: ; preds = %for.body
%inc = add nsw i32 %i.02, 1
%cmp = icmp slt i32 %inc, %N
br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge
for.cond.for.end_crit_edge: ; preds = %for.inc
br label %for.end
for.end: ; preds = %for.cond.for.end_crit_edge, %entry
ret void
}
define void @foo1(i32* %A, i32* %B, i32* %C, i32 %N) {
; CHECK-LABEL: @foo1(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 0, %N
; CHECK-NEXT: br i1 [[CMP1]], label %for.body.lr.ph, label %for.end
; CHECK: for.body.lr.ph:
; CHECK-NEXT: br label %for.body
; CHECK: for.body:
; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV:%.*]].next, %for.inc ], [ 0, %for.body.lr.ph ]
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i32, i32* %B, i64 [[INDVARS_IV]]
; CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* [[ARRAYIDX]], align 4
; CHECK-NEXT: [[TMP1:%.*]] = add nuw nsw i64 [[INDVARS_IV]], 2
; CHECK-NEXT: [[ARRAYIDX2:%.*]] = getelementptr inbounds i32, i32* %C, i64 [[TMP1]]
; CHECK-NEXT: [[TMP2:%.*]] = load i32, i32* [[ARRAYIDX2]], align 4
; CHECK-NEXT: [[ADD3:%.*]] = add nsw i32 [[TMP0]], [[TMP2]]
; CHECK-NEXT: [[ARRAYIDX5:%.*]] = getelementptr inbounds i32, i32* %A, i64 [[INDVARS_IV]]
; CHECK-NEXT: store i32 [[ADD3]], i32* [[ARRAYIDX5]], align 4
; CHECK-NEXT: br label %for.inc
; CHECK: for.inc:
; CHECK-NEXT: [[INDVARS_IV_NEXT:%.*]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT: [[WIDE_TRIP_COUNT:%.*]] = zext i32 %N to i64
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i64 [[INDVARS_IV_NEXT]], [[WIDE_TRIP_COUNT]]
; CHECK-NEXT: br i1 [[EXITCOND]], label %for.body, label %for.cond.for.end_crit_edge
; CHECK: for.cond.for.end_crit_edge:
; CHECK-NEXT: br label %for.end
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
%cmp1 = icmp slt i32 0, %N
br i1 %cmp1, label %for.body.lr.ph, label %for.end
for.body.lr.ph: ; preds = %entry
br label %for.body
for.body: ; preds = %for.body.lr.ph, %for.inc
%i.02 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.inc ]
%idxprom = zext i32 %i.02 to i64
%arrayidx = getelementptr inbounds i32, i32* %B, i64 %idxprom
%0 = load i32, i32* %arrayidx, align 4
%add = add nsw i32 %i.02, 2
%idxprom1 = sext i32 %add to i64
%arrayidx2 = getelementptr inbounds i32, i32* %C, i64 %idxprom1
%1 = load i32, i32* %arrayidx2, align 4
%add3 = add nsw i32 %0, %1
%idxprom4 = sext i32 %i.02 to i64
%arrayidx5 = getelementptr inbounds i32, i32* %A, i64 %idxprom4
store i32 %add3, i32* %arrayidx5, align 4
br label %for.inc
for.inc: ; preds = %for.body
%inc = add nsw i32 %i.02, 1
%cmp = icmp slt i32 %inc, %N
br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge
for.cond.for.end_crit_edge: ; preds = %for.inc
br label %for.end
for.end: ; preds = %for.cond.for.end_crit_edge, %entry
ret void
}
@a = common global [100 x i32] zeroinitializer, align 16
@b = common global [100 x i32] zeroinitializer, align 16
define i32 @foo2(i32 %M) {
; CHECK-LABEL: @foo2(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 0, %M
; CHECK-NEXT: br i1 [[CMP1]], label %for.body.lr.ph, label %for.end
; CHECK: for.body.lr.ph:
; CHECK-NEXT: [[TMP0:%.*]] = sext i32 %M to i64
; CHECK-NEXT: br label %for.body
; CHECK: for.body:
; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV:%.*]].next, %for.inc ], [ 0, %for.body.lr.ph ]
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [100 x i32], [100 x i32]* @a, i64 0, i64 [[INDVARS_IV]]
; CHECK-NEXT: [[TMP1:%.*]] = load i32, i32* [[ARRAYIDX]], align 4
; CHECK-NEXT: [[ARRAYIDX2:%.*]] = getelementptr inbounds [100 x i32], [100 x i32]* @b, i64 0, i64 [[INDVARS_IV]]
; CHECK-NEXT: [[TMP2:%.*]] = load i32, i32* [[ARRAYIDX2]], align 4
; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[TMP1]], [[TMP2]]
; CHECK-NEXT: [[TMP3:%.*]] = add nsw i64 [[INDVARS_IV]], [[TMP0]]
; CHECK-NEXT: [[ARRAYIDX5:%.*]] = getelementptr inbounds [100 x i32], [100 x i32]* @a, i64 0, i64 [[TMP3]]
; CHECK-NEXT: store i32 [[ADD]], i32* [[ARRAYIDX5]], align 4
; CHECK-NEXT: br label %for.inc
; CHECK: for.inc:
; CHECK-NEXT: [[INDVARS_IV_NEXT:%.*]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT: [[WIDE_TRIP_COUNT:%.*]] = zext i32 %M to i64
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i64 [[INDVARS_IV_NEXT]], [[WIDE_TRIP_COUNT]]
; CHECK-NEXT: br i1 [[EXITCOND]], label %for.body, label %for.cond.for.end_crit_edge
; CHECK: for.cond.for.end_crit_edge:
; CHECK-NEXT: br label %for.end
; CHECK: for.end:
; CHECK-NEXT: [[CALL:%.*]] = call i32 @dummy(i32* getelementptr inbounds ([100 x i32], [100 x i32]* @a, i32 0, i32 0), i32* getelementptr inbounds ([100 x i32], [100 x i32]* @b, i32 0, i32 0))
; CHECK-NEXT: ret i32 0
;
entry:
%cmp1 = icmp slt i32 0, %M
br i1 %cmp1, label %for.body.lr.ph, label %for.end
for.body.lr.ph: ; preds = %entry
br label %for.body
for.body: ; preds = %for.body.lr.ph, %for.inc
%i.02 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.inc ]
%idxprom = zext i32 %i.02 to i64
%arrayidx = getelementptr inbounds [100 x i32], [100 x i32]* @a, i64 0, i64 %idxprom
%0 = load i32, i32* %arrayidx, align 4
%idxprom1 = sext i32 %i.02 to i64
%arrayidx2 = getelementptr inbounds [100 x i32], [100 x i32]* @b, i64 0, i64 %idxprom1
%1 = load i32, i32* %arrayidx2, align 4
%add = add nsw i32 %0, %1
%add3 = add nsw i32 %i.02, %M
%idxprom4 = sext i32 %add3 to i64
%arrayidx5 = getelementptr inbounds [100 x i32], [100 x i32]* @a, i64 0, i64 %idxprom4
store i32 %add, i32* %arrayidx5, align 4
br label %for.inc
for.inc: ; preds = %for.body
%inc = add nsw i32 %i.02, 1
%cmp = icmp slt i32 %inc, %M
br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge
for.cond.for.end_crit_edge: ; preds = %for.inc
br label %for.end
for.end: ; preds = %for.cond.for.end_crit_edge, %entry
%call = call i32 @dummy(i32* getelementptr inbounds ([100 x i32], [100 x i32]* @a, i32 0, i32 0), i32* getelementptr inbounds ([100 x i32], [100 x i32]* @b, i32 0, i32 0))
ret i32 0
}
declare i32 @dummy(i32*, i32*)
; A case where zext should not be eliminated when its operands could only be extended by sext.
define i32 @foo3(i32 %M) {
; CHECK-LABEL: @foo3(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 0, %M
; CHECK-NEXT: br i1 [[CMP1]], label %for.body.lr.ph, label %for.end
; CHECK: for.body.lr.ph:
; CHECK-NEXT: [[TMP0:%.*]] = sext i32 %M to i64
; CHECK-NEXT: br label %for.body
; CHECK: for.body:
; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV:%.*]].next, %for.inc ], [ 0, %for.body.lr.ph ]
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [100 x i32], [100 x i32]* @a, i64 0, i64 [[INDVARS_IV]]
; CHECK-NEXT: [[TMP1:%.*]] = load i32, i32* [[ARRAYIDX]], align 4
; CHECK-NEXT: [[ARRAYIDX2:%.*]] = getelementptr inbounds [100 x i32], [100 x i32]* @b, i64 0, i64 [[INDVARS_IV]]
; CHECK-NEXT: [[TMP2:%.*]] = load i32, i32* [[ARRAYIDX2]], align 4
; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[TMP1]], [[TMP2]]
; CHECK-NEXT: [[TMP3:%.*]] = add nsw i64 [[INDVARS_IV]], [[TMP0]]
; CHECK-NEXT: [[TMP4:%.*]] = trunc i64 [[TMP3]] to i32
; CHECK-NEXT: [[IDXPROM4:%.*]] = zext i32 [[TMP4]] to i64
; CHECK-NEXT: [[ARRAYIDX5:%.*]] = getelementptr inbounds [100 x i32], [100 x i32]* @a, i64 0, i64 [[IDXPROM4]]
; CHECK-NEXT: store i32 [[ADD]], i32* [[ARRAYIDX5]], align 4
; CHECK-NEXT: br label %for.inc
; CHECK: for.inc:
; CHECK-NEXT: [[INDVARS_IV_NEXT:%.*]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT: [[WIDE_TRIP_COUNT:%.*]] = zext i32 %M to i64
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i64 [[INDVARS_IV_NEXT]], [[WIDE_TRIP_COUNT]]
; CHECK-NEXT: br i1 [[EXITCOND]], label %for.body, label %for.cond.for.end_crit_edge
; CHECK: for.cond.for.end_crit_edge:
; CHECK-NEXT: br label %for.end
; CHECK: for.end:
; CHECK-NEXT: [[CALL:%.*]] = call i32 @dummy(i32* getelementptr inbounds ([100 x i32], [100 x i32]* @a, i32 0, i32 0), i32* getelementptr inbounds ([100 x i32], [100 x i32]* @b, i32 0, i32 0))
; CHECK-NEXT: ret i32 0
;
entry:
%cmp1 = icmp slt i32 0, %M
br i1 %cmp1, label %for.body.lr.ph, label %for.end
for.body.lr.ph: ; preds = %entry
br label %for.body
for.body: ; preds = %for.body.lr.ph, %for.inc
%i.02 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.inc ]
%idxprom = sext i32 %i.02 to i64
%arrayidx = getelementptr inbounds [100 x i32], [100 x i32]* @a, i64 0, i64 %idxprom
%0 = load i32, i32* %arrayidx, align 4
%idxprom1 = sext i32 %i.02 to i64
%arrayidx2 = getelementptr inbounds [100 x i32], [100 x i32]* @b, i64 0, i64 %idxprom1
%1 = load i32, i32* %arrayidx2, align 4
%add = add nsw i32 %0, %1
%add3 = add nsw i32 %i.02, %M
%idxprom4 = zext i32 %add3 to i64
%arrayidx5 = getelementptr inbounds [100 x i32], [100 x i32]* @a, i64 0, i64 %idxprom4
store i32 %add, i32* %arrayidx5, align 4
br label %for.inc
for.inc: ; preds = %for.body
%inc = add nsw i32 %i.02, 1
%cmp = icmp slt i32 %inc, %M
br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge
for.cond.for.end_crit_edge: ; preds = %for.inc
br label %for.end
for.end: ; preds = %for.cond.for.end_crit_edge, %entry
%call = call i32 @dummy(i32* getelementptr inbounds ([100 x i32], [100 x i32]* @a, i32 0, i32 0), i32* getelementptr inbounds ([100 x i32], [100 x i32]* @b, i32 0, i32 0))
ret i32 0
}
%struct.image = type {i32, i32}
define i32 @foo4(%struct.image* %input, i32 %length, i32* %in) {
entry:
%stride = getelementptr inbounds %struct.image, %struct.image* %input, i64 0, i32 1
%0 = load i32, i32* %stride, align 4
%cmp17 = icmp sgt i32 %length, 1
br i1 %cmp17, label %for.body.lr.ph, label %for.cond.cleanup
for.body.lr.ph: ; preds = %entry
%channel = getelementptr inbounds %struct.image, %struct.image* %input, i64 0, i32 0
br label %for.body
for.cond.cleanup.loopexit: ; preds = %for.body
%1 = phi i32 [ %6, %for.body ]
br label %for.cond.cleanup
for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry
%2 = phi i32 [ 0, %entry ], [ %1, %for.cond.cleanup.loopexit ]
ret i32 %2
; mul instruction below is widened instead of generating a truncate instruction for it
; regardless if Load operand of mul is inside or outside the loop (we have both cases).
; CHECK: for.body:
; CHECK-NOT: trunc
for.body: ; preds = %for.body.lr.ph, %for.body
%x.018 = phi i32 [ 1, %for.body.lr.ph ], [ %add, %for.body ]
%add = add nuw nsw i32 %x.018, 1
%3 = load i32, i32* %channel, align 8
%mul = mul nsw i32 %3, %add
%idx.ext = sext i32 %mul to i64
%add.ptr = getelementptr inbounds i32, i32* %in, i64 %idx.ext
%4 = load i32, i32* %add.ptr, align 4
%mul1 = mul nsw i32 %0, %add
%idx.ext1 = sext i32 %mul1 to i64
%add.ptr1 = getelementptr inbounds i32, i32* %in, i64 %idx.ext1
%5 = load i32, i32* %add.ptr1, align 4
%6 = add i32 %4, %5
%cmp = icmp slt i32 %add, %length
br i1 %cmp, label %for.body, label %for.cond.cleanup.loopexit
}
define i32 @foo5(%struct.image* %input, i32 %length, i32* %in) {
entry:
%stride = getelementptr inbounds %struct.image, %struct.image* %input, i64 0, i32 1
%0 = load i32, i32* %stride, align 4
%cmp17 = icmp sgt i32 %length, 1
br i1 %cmp17, label %for.body.lr.ph, label %for.cond.cleanup
for.body.lr.ph: ; preds = %entry
%channel = getelementptr inbounds %struct.image, %struct.image* %input, i64 0, i32 0
br label %for.body
for.cond.cleanup.loopexit: ; preds = %for.body
%1 = phi i32 [ %7, %for.body ]
br label %for.cond.cleanup
for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry
%2 = phi i32 [ 0, %entry ], [ %1, %for.cond.cleanup.loopexit ]
ret i32 %2
; This example is the same as above except that the first mul is used in two places
; and this may result in having two versions of the multiply: an i32 and i64 version.
; In this case, keep the trucate instructions to avoid this redundancy.
; CHECK: for.body:
; CHECK: trunc
for.body: ; preds = %for.body.lr.ph, %for.body
%x.018 = phi i32 [ 1, %for.body.lr.ph ], [ %add, %for.body ]
%add = add nuw nsw i32 %x.018, 1
%3 = load i32, i32* %channel, align 8
%mul = mul nsw i32 %3, %add
%idx.ext = sext i32 %mul to i64
%add.ptr = getelementptr inbounds i32, i32* %in, i64 %idx.ext
%4 = load i32, i32* %add.ptr, align 4
%mul1 = mul nsw i32 %0, %add
%idx.ext1 = sext i32 %mul1 to i64
%add.ptr1 = getelementptr inbounds i32, i32* %in, i64 %idx.ext1
%5 = load i32, i32* %add.ptr1, align 4
%6 = add i32 %4, %5
%7 = add i32 %6, %mul
%cmp = icmp slt i32 %add, %length
br i1 %cmp, label %for.body, label %for.cond.cleanup.loopexit
}
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