230c8c56f2
In analyzing issue #56483, it was noticed that running `opt` with `-reassociate` was missing some minor optimizations. For example, there were cases where the running `opt` on IR with floating-point instructions that have the `fast` flags applied, sometimes resulted in less efficient code than the input IR (things like dead instructions left behind, and missed reassociations). These were sometimes noted in the test-files with TODOs, to investigate further. This commit fixes some of these problems, removing some TODOs in the process. FTR, I refer to these as "minor" missed optimizations, because when running a full clang/llvm compilation, these inefficiencies are not happening, as other passes clean that residue up. Regardless, having cleaner IR produced by `opt`, makes assessing the quality of fixes done in `opt` easier.
18 lines
555 B
LLVM
18 lines
555 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -reassociate -S | FileCheck %s
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define float @wibble(float %tmp6) #0 {
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; CHECK-LABEL: @wibble(
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; CHECK-NEXT: bb:
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; CHECK-NEXT: [[TMP7:%.*]] = fmul float [[TMP6:%.*]], -1.000000e+00
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; CHECK-NEXT: [[TMP9:%.*]] = fmul fast float [[TMP6]], 0xFFF0000000000000
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; CHECK-NEXT: ret float [[TMP9]]
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;
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bb:
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%tmp7 = fsub float -0.000000e+00, %tmp6
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%tmp9 = fmul fast float %tmp7, 0x7FF0000000000000
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ret float %tmp9
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}
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attributes #0 = { "use-soft-float"="false" }
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