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3 Commits

Author SHA1 Message Date
Sanjay Patel cddcd7256c [LibCallSimplifier] use instruction-level fast-math-flags for tan/atan transform 
llvm-svn: 256964
 2016-01-06 19:23:35 +00:00
Benjamin Kramer fb419e71f4 [SimplifyLibCalls] Don't depend on a called function having a name, it might be an indirect call. 
Fixes the crasher in PR25651 and related crashers using the same pattern.

llvm-svn: 254145
 2015-11-26 09:51:17 +00:00
Davide Italiano 51507d2ad8 [SimplifyLibCalls] New transformation: tan(atan(x)) -> x 
This is enabled only under -ffast-math.
So, instead of emitting:
  4007b0:       50                      push   %rax
  4007b1:       e8 8a fd ff ff          callq  400540 <atanf@plt>
  4007b6:       58                      pop    %rax
  4007b7:       e9 94 fd ff ff          jmpq   400550 <tanf@plt>
  4007bc:       0f 1f 40 00             nopl   0x0(%rax)

for:
float mytan(float x) {
  return tanf(atanf(x));
}
we emit a single retq.

Differential Revision:	 http://reviews.llvm.org/D14302

llvm-svn: 252098
 2015-11-04 23:36:56 +00:00