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[Reassociate] add test for missing FP constant analysis; NFC

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@336208 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjay Patel
2018-07-03 15:56:04 +00:00
parent a9961f34ed
commit 85678535ba
1 changed files with 19 additions and 3 deletions
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22
test/Transforms/Reassociate/absorption.ll
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@@ -1,11 +1,27 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -reassociate < %s | FileCheck %s
; Check that if constants combine to an absorbing value then the expression is
; evaluated as the absorbing value.
define i8 @foo(i8 %x) {
define i8 @or_all_ones(i8 %x) {
; CHECK-LABEL: @or_all_ones(
; CHECK-NEXT: ret i8 -1
;
%tmp1 = or i8 %x, 127
%tmp2 = or i8 %tmp1, 128
ret i8 %tmp2
; CHECK-LABEL: @foo(
; CHECK: ret i8 -1
}
; TODO: fmul by 0.0 with nsz+nnan should have simplified to 0.0.
define double @fmul_zero(double %x) {
; CHECK-LABEL: @fmul_zero(
; CHECK-NEXT: [[R:%.*]] = fmul fast double [[X:%.*]], 0.000000e+00
; CHECK-NEXT: ret double [[R]]
;
%x4 = fmul fast double %x, 4.0
%r = fmul fast double %x4, 0.0
ret double %r
}