85b289377b
The original commit ( fe1f3cfc26 ) was reverted because it could
crash / assert when trying to fold a value that was replaced
by a constant. In that case, there might not be an entry for the
constant in the solver yet.
This version adds a check for that possibility along with tests to
exercise that pattern (they used to crash).
Original commit message:
This extends the transform added with D81756 to handle div/rem opcodes.
For example:
https://alive2.llvm.org/ce/z/cX6za6
This replicates part of what CVP already does, but the motivating example
from issue #57472 demonstrates a phase ordering problem - we convert
branches to select before CVP runs and miss the transform.
Differential Revision: https://reviews.llvm.org/D133198
25 lines
611 B
LLVM
25 lines
611 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=ipsccp -S < %s | FileCheck %s
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@g = internal global i32 42, align 4
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define i32 @sdiv_const_undef() {
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; CHECK-LABEL: @sdiv_const_undef(
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; CHECK-NEXT: [[D:%.*]] = sdiv i32 42, poison
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; CHECK-NEXT: ret i32 [[D]]
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;
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%i = load i32, ptr @g, align 4
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%d = sdiv i32 %i, poison
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ret i32 %d
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}
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define i32 @sdiv_undef_const() {
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; CHECK-LABEL: @sdiv_undef_const(
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; CHECK-NEXT: [[D:%.*]] = sdiv i32 poison, 42
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; CHECK-NEXT: ret i32 [[D]]
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;
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%i = load i32, ptr @g, align 4
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%d = sdiv i32 poison, %i
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ret i32 %d
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}
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