13ffde316a
Remove compares after replacing all uses. Cleaning dead compares can enable additional simplifications when adjusting the position of the pass slightly. In particular, it seems like the additional dead instructions may prevent SimplifyCFG performing some folds. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D158760
45 lines
1.2 KiB
LLVM
45 lines
1.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
|
|
; RUN: opt -passes=constraint-elimination -S %s | FileCheck %s
|
|
|
|
; Make sure constraints where all variable coefficients are 0 are handled
|
|
; properly.
|
|
|
|
define i1 @test_1_always_false(i32 %A, i32 %B) {
|
|
; CHECK-LABEL: @test_1_always_false(
|
|
; CHECK-NEXT: br i1 false, label [[IF_END_I16:%.*]], label [[IF_THEN_I10:%.*]]
|
|
; CHECK: if.then.i10:
|
|
; CHECK-NEXT: ret i1 false
|
|
; CHECK: if.end.i16:
|
|
; CHECK-NEXT: ret i1 false
|
|
;
|
|
%c.1 = icmp ugt i32 %A, %A
|
|
br i1 %c.1, label %if.end.i16, label %if.then.i10
|
|
|
|
if.then.i10:
|
|
ret i1 false
|
|
|
|
if.end.i16:
|
|
%c.2 = icmp ugt i32 %A, %A
|
|
ret i1 %c.2
|
|
}
|
|
|
|
define i1 @test_2_always_true(i32 %A, i32 %B) {
|
|
; CHECK-LABEL: @test_2_always_true(
|
|
; CHECK-NEXT: [[C_1:%.*]] = icmp uge i32 [[A:%.*]], [[B:%.*]]
|
|
; CHECK-NEXT: br i1 [[C_1]], label [[IF_END_I16:%.*]], label [[IF_THEN_I10:%.*]]
|
|
; CHECK: if.then.i10:
|
|
; CHECK-NEXT: ret i1 false
|
|
; CHECK: if.end.i16:
|
|
; CHECK-NEXT: ret i1 true
|
|
;
|
|
%c.1 = icmp uge i32 %A, %B
|
|
br i1 %c.1, label %if.end.i16, label %if.then.i10
|
|
|
|
if.then.i10:
|
|
ret i1 false
|
|
|
|
if.end.i16:
|
|
%c.2 = icmp uge i32 %A, %A
|
|
ret i1 %c.2
|
|
}
|