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llvm-project/llvm/lib/Transforms/InstCombine
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Zain Jaffal f61f99a105
[instcombine] Optimise for zero initialisation of product given fast flags are enabled 
Currently, clang ignores the 0 initialisation in finite math
For example:

```
double f_prod = 0;
double arr[1000];
for (size_t i = 0; i < 1000; i++) {
  f_prod *= arr[i];
 }
```
Clang will ignore that `f_prod` is set to zero and it will generate assembly to iterate over the loop.

Reviewed By: fhahn, spatel

Differential Revision: https://reviews.llvm.org/D131672
 		2022-08-17 11:12:15 +01:00
..
CMakeLists.txt
…
InstCombineAddSub.cpp [InstCombine] fold reassociative fadd with negated operand 2022-08-11 11:43:36 -04:00
InstCombineAndOrXor.cpp [InstCombine] fix "X|(X^Y)" pattern-matching for commuted variants 2022-08-13 11:02:28 -04:00
InstCombineAtomicRMW.cpp [LLVM] Add the support for fmax and fmin in atomicrmw instruction 2022-07-06 10:57:53 -04:00
InstCombineCalls.cpp InstCombine: use poison instead of undef as placeholder in insertvalue [NFC] 2022-08-14 21:37:23 +01:00
InstCombineCasts.cpp [InstCombine] Make use of low zero bits to determine exact int->fp cast 2022-07-05 09:15:12 +08:00
InstCombineCompares.cpp [InstCombine] reduce sub-with-overflow ==/!= 0 2022-08-15 13:03:51 -04:00
InstCombineInternal.h [InstCombine] add helper function for extract of with-overflow-intrinsic; NFC 2022-08-09 12:38:11 -04:00
InstCombineLoadStoreAlloca.cpp InstCombine: use poison instead of undef as placeholder in insertvalue [NFC] 2022-08-14 21:37:23 +01:00
InstCombineMulDivRem.cpp [instcombine] Optimise for zero initialisation of product given fast flags are enabled 2022-08-17 11:12:15 +01:00
InstCombineNegator.cpp [llvm] LLVM_FALLTHROUGH => [[fallthrough]]. NFC 2022-08-08 11:24:15 -07:00
InstCombinePHI.cpp [InstCombine] Improve check for catchswitch BBs (NFC) 2022-06-15 01:06:13 -07:00
InstCombineSelect.cpp [llvm] LLVM_FALLTHROUGH => [[fallthrough]]. NFC 2022-08-08 11:24:15 -07:00
InstCombineShifts.cpp [InstCombine] Add mul with negated power of 2 constant to canEvaluateShifted. 2022-07-20 11:00:22 -07:00
InstCombineSimplifyDemanded.cpp [llvm] LLVM_FALLTHROUGH => [[fallthrough]]. NFC 2022-08-08 11:24:15 -07:00
InstCombineVectorOps.cpp [llvm] LLVM_FALLTHROUGH => [[fallthrough]]. NFC 2022-08-08 11:24:15 -07:00
InstructionCombining.cpp [Transforms] Qualify auto in range-based for loops (NFC) 2022-08-14 12:51:58 -07:00