hxy9243 created this revision.
hxy9243 added reviewers: sebpop, majnemer, wmi.
hxy9243 added subscribers: hiraditya, llvm-commits.
hxy9243 set the repository for this revision to rL LLVM.
This patch converts clamp at DAG level in DAGCombiner.cpp. For example, the following code:
```
float clamp(float a)
{
const float b = 255.0;
const float c = 0.0;
if(b < a)
return b;
if(a < c)
return c;
return a;
}
```
could be compiled:
```
clamp: // @clamp
// BB#0: // %entry
adrp x8, .LCPI0_0
ldr s1, [x8, :lo12:.LCPI0_0]
fmov s2, wzr
fmaxnm s0, s0, s2
fminnm s0, s0, s1
ret
```
I work with @hiraditya on this patch.
Repository:
rL LLVM
https://reviews.llvm.org/D24033
Files:
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
llvm/test/CodeGen/AArch64/aarch64-DAGCombine-fminmax.ll
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