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pow problem (from Phalanger test suite) #156
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Fixed in cbea3f5 |
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Jan 25, 2018
Summary: This adds the Aarch64 equivalent code that was seen at the bottom of commit 1c338be. This takes advantage of the assert to save 2 instructions per instance. The standard regression tests were run with 6 option sets. No new problems were observed. The generated assembly code was as expected. Before ===== 0000000005e8b574 <_ZN4HPHP5ffs64Em>: ... 5e8b5e4: 52801382 mov w2, #0x9c // #156 5e8b5e8: 97dc48c9 bl 559d90c <_ZN4HPHP11assert_failEPKcS1_jS1_RKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE> 5e8b5ec: f94017a0 ldr x0, [x29,#40] 5e8b5f0: f100001f cmp x0, #0x0 //<<--- 5e8b5f4: dac00000 rbit x0, x0 //<<--- 5e8b5f8: dac01000 clz x0, x0 //<<--- 5e8b5fc: 9a8007e0 csinc x0, xzr, x0, eq //<<--- 5e8b600: 51000400 sub w0, w0, #0x1 After ==== 0000000005e8b574 <_ZN4HPHP5ffs64Em>: ... 5e8b5e4: 52801382 mov w2, #0x9c // #156 5e8b5e8: 97dc48c9 bl 559d90c <_ZN4HPHP11assert_failEPKcS1_jS1_RKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE> 5e8b5ec: f94017a0 ldr x0, [x29,#40] 5e8b5f0: dac00000 rbit x0, x0 //<<--- 5e8b5f4: dac01000 clz x0, x0 //<<--- 5e8b5f8: f90023a0 str x0, [x29,#64] 5e8b5fc: f94023a0 ldr x0, [x29,#64] Closes #8077 Reviewed By: edwinsmith Differential Revision: D6766056 Pulled By: mxw fbshipit-source-id: 65242fbf90ed8fbc39e2f3776e251e248ff3cab2
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Apparently this is meant to return inf, but in hphpi returns 0.
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