pierre.langlois d1472d65dd [arm] Optimize vcmp when lhs operand is #0.0 ... This patch checks the type of the lhs operand of a floating point comparison for ARM, and commutes the operands if it is #0.0. It allows us to optimize a comparison with zero, as the vcmp instruction accepts #0.0 as rhs operand. Code before for "0.0 < 0.123": ------------------------------ movw ip, #29360 movt ip, #37224 movw r9, #31981 movt r9, #16319 vmov d0, ip, r9 mov ip, #0 vmov d1, ip, ip vcmp.f64 d1, d0 vmrs APSR, FPSCR bcc +12 Code after: ----------- movw ip, #29360 movt ip, #37224 movw r9, #31981 movt r9, #16319 vmov d0, ip, r9 vcmp.f64 d0, #0.0 vmrs APSR, FPSCR bgt +12 BUG= Review URL: https://codereview.chromium.org/1361913003 Cr-Commit-Position: refs/heads/master@{#30911}		2015-09-24 12:04:16 +00:00
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instruction-selector-arm-unittest.cc	[arm] Optimize vcmp when lhs operand is #0.0	2015-09-24 12:04:16 +00:00