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identical instructions into a single instruction. For example, for: void test(vector float *x, vector float *y, int *P) { int v = vec_any_out(*x, *y); *x = (vector float)vec_cmpb(*x, *y); *P = v; } we now generate: _test: mfspr r2, 256 oris r6, r2, 49152 mtspr 256, r6 lvx v0, 0, r4 lvx v1, 0, r3 vcmpbfp. v0, v1, v0 mfcr r4, 2 stvx v0, 0, r3 rlwinm r3, r4, 27, 31, 31 xori r3, r3, 1 stw r3, 0(r5) mtspr 256, r2 blr instead of: _test: mfspr r2, 256 oris r6, r2, 57344 mtspr 256, r6 lvx v0, 0, r4 lvx v1, 0, r3 vcmpbfp. v2, v1, v0 mfcr r4, 2 *** vcmpbfp v0, v1, v0 rlwinm r4, r4, 27, 31, 31 stvx v0, 0, r3 xori r3, r4, 1 stw r3, 0(r5) mtspr 256, r2 blr Testcase here: CodeGen/PowerPC/vcmp-fold.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27290 91177308-0d34-0410-b5e6-96231b3b80d8 |
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