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e306a84b0e
For PHIs with multiple incoming values, we can improve precision by using constant ranges for integers. We can over-approximate phis by merging the incoming values. Reviewers: davide, efriedma, mssimpso Reviewed By: efriedma Differential Revision: https://reviews.llvm.org/D71933
98 lines
2.6 KiB
LLVM
98 lines
2.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -ipsccp -S | FileCheck %s
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declare void @use(i1)
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define void @sdiv1_cmp_constants(i32 %x) {
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; CHECK-LABEL: @sdiv1_cmp_constants(
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; CHECK-NEXT: [[D:%.*]] = sdiv i32 1, [[X:%.*]]
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; CHECK-NEXT: [[C_0:%.*]] = icmp slt i32 0, [[D]]
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; CHECK-NEXT: call void @use(i1 [[C_0]])
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; CHECK-NEXT: call void @use(i1 false)
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; CHECK-NEXT: call void @use(i1 false)
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; CHECK-NEXT: [[C_3:%.*]] = icmp eq i32 1, [[D]]
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; CHECK-NEXT: call void @use(i1 [[C_3]])
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; CHECK-NEXT: [[C_4:%.*]] = icmp eq i32 0, [[D]]
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; CHECK-NEXT: call void @use(i1 [[C_4]])
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; CHECK-NEXT: call void @use(i1 false)
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; CHECK-NEXT: ret void
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;
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%d = sdiv i32 1, %x
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%c.0 = icmp slt i32 0, %d
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call void @use(i1 %c.0)
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%c.1 = icmp slt i32 1, %d
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call void @use(i1 %c.1)
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%c.2 = icmp slt i32 2, %d
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call void @use(i1 %c.2)
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%c.3 = icmp eq i32 1, %d
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call void @use(i1 %c.3)
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%c.4 = icmp eq i32 0, %d
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call void @use(i1 %c.4)
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%c.5 = icmp eq i32 2, %d
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call void @use(i1 %c.5)
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ret void
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}
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define void @sdiv1_cmp_range_1(i32 %x, i1 %c) {
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; CHECK-LABEL: @sdiv1_cmp_range_1(
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; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: br label [[BB3:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: br label [[BB3]]
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; CHECK: bb3:
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; CHECK-NEXT: [[P:%.*]] = phi i32 [ 1, [[BB1]] ], [ 2, [[BB2]] ]
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; CHECK-NEXT: [[D:%.*]] = sdiv i32 1, [[X:%.*]]
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; CHECK-NEXT: call void @use(i1 false)
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; CHECK-NEXT: [[C_1:%.*]] = icmp eq i32 [[P]], [[D]]
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; CHECK-NEXT: call void @use(i1 [[C_1]])
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; CHECK-NEXT: ret void
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;
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br i1 %c, label %bb1, label %bb2
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bb1:
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br label %bb3
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bb2:
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br label %bb3
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bb3:
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%p = phi i32 [1, %bb1], [2, %bb2]
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%d = sdiv i32 1, %x
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%c.0 = icmp slt i32 %p, %d
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call void @use(i1 %c.0)
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%c.1 = icmp eq i32 %p, %d
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call void @use(i1 %c.1)
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ret void
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}
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define void @sdiv1_cmp_range_2(i32 %x, i1 %c) {
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; CHECK-LABEL: @sdiv1_cmp_range_2(
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; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: br label [[BB3:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: br label [[BB3]]
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; CHECK: bb3:
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; CHECK-NEXT: [[P:%.*]] = phi i32 [ 3, [[BB1]] ], [ 2, [[BB2]] ]
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; CHECK-NEXT: [[D:%.*]] = sdiv i32 1, [[X:%.*]]
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; CHECK-NEXT: call void @use(i1 false)
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; CHECK-NEXT: call void @use(i1 false)
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; CHECK-NEXT: ret void
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;
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br i1 %c, label %bb1, label %bb2
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bb1:
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br label %bb3
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bb2:
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br label %bb3
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bb3:
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%p = phi i32 [3, %bb1], [2, %bb2]
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%d = sdiv i32 1, %x
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%c.0 = icmp slt i32 %p, %d
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call void @use(i1 %c.0)
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%c.1 = icmp eq i32 %p, %d
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call void @use(i1 %c.1)
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ret void
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}
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